Public bug reported:

I read that from 1.10 to 1.14 things changed and that i need to use logind. So 
I removed files that were working with lightdm 1.10 and tried to set it up the 
"logind" way.
I removed my xorg.conf and got a bare lightdm.conf (see below)
Am I overlooking something obvious that prevent the second X server to launch 
properly like it used to with version 1.10 ?

thanks

I got 2 GPU, 2 screens.
I configured logind that way :
loginctl attach seat-1 
/sys/devices/pci0000:00/0000:00:07.0/0000:03:00.0/drm/card1
loginctl attach seat-1 
/sys/devices/pci0000:00/0000:00:07.0/0000:03:00.0/graphics/fb1
loginctl attach seat-1 
/sys/devices/pci0000:00/0000:00:07.0/0000:03:00.1/sound/card2
loginctl attach seat-1 /sys/devices/pci0000:00/0000:00:1d.2/usb8

resulting in those udev rules :
cat /etc/udev/rules.d/72-seat-drm-pci-0000_03_00_0.rules 
/etc/udev/rules.d/72-seat-graphics-pci-0000_03_00_0.rules 
/etc/udev/rules.d/72-seat-sound-pci-0000_03_00_1.rules 
/etc/udev/rules.d/72-seat-usb-pci-0000_00_1d_2.rules

TAG=="seat", ENV{ID_FOR_SEAT}=="drm-pci-0000_03_00_0", ENV{ID_SEAT}="seat-1"
TAG=="seat", ENV{ID_FOR_SEAT}=="graphics-pci-0000_03_00_0", 
ENV{ID_SEAT}="seat-1"
TAG=="seat", ENV{ID_FOR_SEAT}=="sound-pci-0000_03_00_1", ENV{ID_SEAT}="seat-1"
TAG=="seat", ENV{ID_FOR_SEAT}=="usb-pci-0000_00_1d_2", ENV{ID_SEAT}="seat-1"

well now only one seat is working :
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.14.0, UID=0 PID=12879
[+0.00s] DEBUG: Loading configuration dirs from 
/usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from 
/usr/share/lightdm/lightdm.conf.d/01_debian.conf
[+0.00s] DEBUG: Loading configuration dirs from 
/usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registered seat module xlocal
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Registered seat module unity
[+0.01s] DEBUG: Monitoring logind for seats
[+0.01s] DEBUG: New seat added from logind: seat0
[+0.01s] DEBUG: Loading properties from config section SeatDefaults
[+0.01s] DEBUG: Seat seat0: Starting
[+0.01s] DEBUG: Seat seat0: Creating greeter session
[+0.01s] DEBUG: Seat seat0: Creating display server of type x
[+0.01s] DEBUG: Could not run plymouth --ping: Failed to execute child process 
"plymouth" (No such file or directory)
[+0.01s] DEBUG: Using VT 7
[+0.01s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.01s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+0.01s] DEBUG: DisplayServer x-0: Writing X server authority to 
/var/run/lightdm/root/:0
[+0.01s] DEBUG: DisplayServer x-0: Launching X Server
[+0.01s] DEBUG: Launching process 12883: /usr/bin/X :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.01s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+0.01s] DEBUG: New seat added from logind: seat-1
[+0.01s] DEBUG: Loading properties from config section SeatDefaults
[+0.01s] DEBUG: Seat seat-1 has property CanMultiSession=no
[+0.01s] DEBUG: Seat seat-1: Starting
[+0.01s] DEBUG: Seat seat-1: Creating greeter session
[+0.01s] DEBUG: Seat seat-1: Creating display server of type x
[+0.01s] DEBUG: Seat seat-1: Starting local X display
[+0.01s] DEBUG: DisplayServer x-1: Logging to /var/log/lightdm/x-1.log
[+0.01s] DEBUG: DisplayServer x-1: Writing X server authority to 
/var/run/lightdm/root/:1
[+0.01s] DEBUG: DisplayServer x-1: Launching X Server
[+0.01s] DEBUG: Launching process 12885: /usr/bin/X :1 -seat seat-1 -sharevts 
-auth /var/run/lightdm/root/:1 -nolisten tcp
[+0.01s] DEBUG: DisplayServer x-1: Waiting for ready signal from X server :1
[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat0
[+0.01s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat1
[+0.01s] WARNING: Error getting user list from org.freedesktop.Accounts: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
org.freedesktop.Accounts was not provided by any .service files
[+0.01s] DEBUG: Loading user config from /etc/lightdm/users.conf
[+0.01s] DEBUG: User clarisse added
[+0.01s] DEBUG: User lotso added
[+0.01s] DEBUG: User max added
[+0.03s] DEBUG: Process 12885 exited with return value 1
[+0.03s] DEBUG: DisplayServer x-1: X server stopped
[+0.03s] DEBUG: DisplayServer x-1: Removing X server authority 
/var/run/lightdm/root/:1
[+0.03s] DEBUG: Seat seat-1: Display server stopped
[+0.03s] DEBUG: Seat seat-1: Stopping; greeter display server failed to start
[+0.03s] DEBUG: Seat seat-1: Stopping
[+0.03s] DEBUG: Seat seat-1: Stopping session
[+0.03s] DEBUG: Seat seat-1: Session stopped
[+0.03s] DEBUG: Seat seat-1: Stopped
[+0.03s] DEBUG: Seat seat-1: Stopping session
[+0.78s] DEBUG: Got signal 10 from process 12883
[+0.78s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+0.78s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+0.78s] DEBUG: Seat seat0: Display server ready, starting session 
authentication
[+0.78s] DEBUG: Session pid=12901: Started with service 'lightdm-greeter', 
username 'lightdm'
[+0.79s] DEBUG: Session pid=12901: Authentication complete with return value 0: 
Success
[+0.79s] DEBUG: Seat seat0: Session authenticated, running command
[+0.79s] DEBUG: Session pid=12901: Running command /usr/sbin/lightdm-gtk-greeter
[+0.79s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
[+0.79s] DEBUG: Session pid=12901: Logging to /var/log/lightdm/x-0-greeter.log
[+0.80s] DEBUG: Activating VT 7
[+0.80s] DEBUG: Activating login1 session c33
[+0.80s] DEBUG: Seat seat0 changes active session to c33
[+0.81s] DEBUG: Session c33 is already active
[+0.86s] DEBUG: Session pid=12901: Greeter connected version=1.14.0 
resettable=false
[+1.13s] DEBUG: Session pid=12901: Greeter start authentication
[+1.13s] DEBUG: Session pid=12920: Started with service 'lightdm', username 
'(null)'
[+1.14s] DEBUG: Session pid=12920: Got 1 message(s) from PAM
[+1.14s] DEBUG: Session pid=12901: Prompt greeter with 1 message(s)


lightdm seems to get that there is another seat, but the X server crashes :
➜  ~  sudo cat /var/log/Xorg.1.log
[ 69158.578]
X.Org X Server 1.17.1
Release Date: 2015-02-10
[ 69158.578] X Protocol Version 11, Revision 0
[ 69158.578] Build Operating System: Linux 3.16.0-4-amd64 x86_64 Debian
[ 69158.578] Current Operating System: Linux bigbenn 4.0.0-1-amd64 #1 SMP 
Debian 4.0.2-1 (2015-05-11) x86_64
[ 69158.578] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.0.0-1-amd64 
root=UUID=eb1bf56f-7f1a-4397-b66b-7d5a5f07bd49 ro quiet
[ 69158.578] Build Date: 04 May 2015  11:22:06PM
[ 69158.578] xorg-server 2:1.17.1-2 (http://www.debian.org/support)
[ 69158.578] Current version of pixman: 0.32.6
[ 69158.578]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[ 69158.578] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 69158.578] (==) Log file: "/var/log/Xorg.1.log", Time: Tue May 26 14:32:44 
2015
[ 69158.578] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 69158.578] (==) No Layout section.  Using the first Screen section.
[ 69158.578] (==) No screen section available. Using defaults.
[ 69158.578] (**) |-->Screen "Default Screen Section" (0)
[ 69158.578] (**) |   |-->Monitor "<default monitor>"
[ 69158.578] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[ 69158.578] (==) Automatically adding devices
[ 69158.578] (==) Automatically enabling devices
[ 69158.578] (==) Automatically adding GPU devices
[ 69158.578] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[ 69158.578]    Entry deleted from font path.
[ 69158.578] (==) FontPath set to:
        /usr/share/fonts/X11/misc,
        /usr/share/fonts/X11/100dpi/:unscaled,
        /usr/share/fonts/X11/75dpi/:unscaled,
        /usr/share/fonts/X11/Type1,
        /usr/share/fonts/X11/100dpi,
        /usr/share/fonts/X11/75dpi,
        built-ins
[ 69158.578] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 69158.578] (II) The server relies on udev to provide the list of input 
devices.
        If no devices become available, reconfigure udev or disable 
AutoAddDevices.
[ 69158.578] (II) Loader magic: 0x7f2a03704d80
[ 69158.578] (II) Module ABI versions:
[ 69158.578]    X.Org ANSI C Emulation: 0.4
[ 69158.578]    X.Org Video Driver: 19.0
[ 69158.578]    X.Org XInput driver : 21.0
[ 69158.578]    X.Org Server Extension : 9.0
[ 69158.579] (II) xfree86: Adding drm device (/dev/dri/card1)
[ 69158.581] (II) LoadModule: "glx"
[ 69158.581] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 69158.582] (II) Module glx: vendor="X.Org Foundation"
[ 69158.582]    compiled for 1.17.1, module version = 1.0.0
[ 69158.582]    ABI class: X.Org Server Extension, version 9.0
[ 69158.582] (==) AIGLX enabled
[ 69158.582] (==) Matched ati as autoconfigured driver 0
[ 69158.582] (==) Matched ati as autoconfigured driver 1
[ 69158.582] (==) Matched modesetting as autoconfigured driver 2
[ 69158.582] (==) Matched fbdev as autoconfigured driver 3
[ 69158.582] (==) Matched vesa as autoconfigured driver 4
[ 69158.582] (==) Assigned the driver to the xf86ConfigLayout
[ 69158.582] (II) LoadModule: "ati"
[ 69158.583] (II) Loading /usr/lib/xorg/modules/drivers/ati_drv.so
[ 69158.583] (II) Module ati: vendor="X.Org Foundation"
[ 69158.583]    compiled for 1.17.1, module version = 7.5.0
[ 69158.583]    Module class: X.Org Video Driver
[ 69158.583]    ABI class: X.Org Video Driver, version 19.0
[ 69158.583] (II) LoadModule: "radeon"
[ 69158.583] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
[ 69158.584] (II) Module radeon: vendor="X.Org Foundation"
[ 69158.584]    compiled for 1.17.1, module version = 7.5.0
[ 69158.584]    Module class: X.Org Video Driver
[ 69158.584]    ABI class: X.Org Video Driver, version 19.0
[ 69158.584] (II) LoadModule: "modesetting"
[ 69158.584] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 69158.584] (II) Module modesetting: vendor="X.Org Foundation"
[ 69158.584]    compiled for 1.17.1, module version = 1.17.1
[ 69158.584]    Module class: X.Org Video Driver
[ 69158.584]    ABI class: X.Org Video Driver, version 19.0
[ 69158.584] (II) LoadModule: "fbdev"
[ 69158.584] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[ 69158.584] (II) Module fbdev: vendor="X.Org Foundation"
[ 69158.584]    compiled for 1.17.1, module version = 0.4.4
[ 69158.584]    Module class: X.Org Video Driver
[ 69158.584]    ABI class: X.Org Video Driver, version 19.0
[ 69158.584] (II) LoadModule: "vesa"
[ 69158.585] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[ 69158.585] (II) Module vesa: vendor="X.Org Foundation"
[ 69158.585]    compiled for 1.17.1, module version = 2.3.3
[ 69158.585]    Module class: X.Org Video Driver
[ 69158.585]    ABI class: X.Org Video Driver, version 19.0
[ 69158.585] (II) RADEON: Driver for ATI Radeon chipsets:
        ATI Radeon Mobility X600 (M24) 3150 (PCIE), ATI FireMV 2400 (PCI),
        ATI Radeon Mobility X300 (M24) 3152 (PCIE),
        ATI FireGL M24 GL 3154 (PCIE), ATI FireMV 2400 3155 (PCI),
        ATI Radeon X600 (RV380) 3E50 (PCIE),
        ATI FireGL V3200 (RV380) 3E54 (PCIE), ATI Radeon IGP320 (A3) 4136,
        ATI Radeon IGP330/340/350 (A4) 4137, ATI Radeon 9500 AD (AGP),
        ATI Radeon 9500 AE (AGP), ATI Radeon 9600TX AF (AGP),
        ATI FireGL Z1 AG (AGP), ATI Radeon 9800SE AH (AGP),
        ATI Radeon 9800 AI (AGP), ATI Radeon 9800 AJ (AGP),
        ATI FireGL X2 AK (AGP), ATI Radeon 9600 AP (AGP),
        ATI Radeon 9600SE AQ (AGP), ATI Radeon 9600XT AR (AGP),
        ATI Radeon 9600 AS (AGP), ATI FireGL T2 AT (AGP), ATI Radeon 9650,
        ATI FireGL RV360 AV (AGP), ATI Radeon 7000 IGP (A4+) 4237,
        ATI Radeon 8500 AIW BB (AGP), ATI Radeon IGP320M (U1) 4336,
        ATI Radeon IGP330M/340M/350M (U2) 4337,
        ATI Radeon Mobility 7000 IGP 4437, ATI Radeon 9000/PRO If (AGP/PCI),
        ATI Radeon 9000 Ig (AGP/PCI), ATI Radeon X800 (R420) JH (AGP),
        ATI Radeon X800PRO (R420) JI (AGP),
        ATI Radeon X800SE (R420) JJ (AGP), ATI Radeon X800 (R420) JK (AGP),
        ATI Radeon X800 (R420) JL (AGP), ATI FireGL X3 (R420) JM (AGP),
        ATI Radeon Mobility 9800 (M18) JN (AGP),
        ATI Radeon X800 SE (R420) (AGP), ATI Radeon X800XT (R420) JP (AGP),
        ATI Radeon X800 VE (R420) JT (AGP), ATI Radeon X850 (R480) (AGP),
        ATI Radeon X850 XT (R480) (AGP), ATI Radeon X850 SE (R480) (AGP),
        ATI Radeon X850 PRO (R480) (AGP), ATI Radeon X850 XT PE (R480) (AGP),
        ATI Radeon Mobility M7 LW (AGP),
        ATI Mobility FireGL 7800 M7 LX (AGP),
        ATI Radeon Mobility M6 LY (AGP), ATI Radeon Mobility M6 LZ (AGP),
        ATI FireGL Mobility 9000 (M9) Ld (AGP),
        ATI Radeon Mobility 9000 (M9) Lf (AGP),
        ATI Radeon Mobility 9000 (M9) Lg (AGP), ATI FireMV 2400 PCI,
        ATI Radeon 9700 Pro ND (AGP), ATI Radeon 9700/9500Pro NE (AGP),
        ATI Radeon 9600TX NF (AGP), ATI FireGL X1 NG (AGP),
        ATI Radeon 9800PRO NH (AGP), ATI Radeon 9800 NI (AGP),
        ATI FireGL X2 NK (AGP), ATI Radeon 9800XT NJ (AGP),
        ATI Radeon Mobility 9600/9700 (M10/M11) NP (AGP),
        ATI Radeon Mobility 9600 (M10) NQ (AGP),
        ATI Radeon Mobility 9600 (M11) NR (AGP),
        ATI Radeon Mobility 9600 (M10) NS (AGP),
        ATI FireGL Mobility T2 (M10) NT (AGP),
        ATI FireGL Mobility T2e (M11) NV (AGP), ATI Radeon QD (AGP),
        ATI Radeon QE (AGP), ATI Radeon QF (AGP), ATI Radeon QG (AGP),
        ATI FireGL 8700/8800 QH (AGP), ATI Radeon 8500 QL (AGP),
        ATI Radeon 9100 QM (AGP), ATI Radeon 7500 QW (AGP/PCI),
        ATI Radeon 7500 QX (AGP/PCI), ATI Radeon VE/7000 QY (AGP/PCI),
        ATI Radeon VE/7000 QZ (AGP/PCI), ATI ES1000 515E (PCI),
        ATI Radeon Mobility X300 (M22) 5460 (PCIE),
        ATI Radeon Mobility X600 SE (M24C) 5462 (PCIE),
        ATI FireGL M22 GL 5464 (PCIE), ATI Radeon X800 (R423) UH (PCIE),
        ATI Radeon X800PRO (R423) UI (PCIE),
        ATI Radeon X800LE (R423) UJ (PCIE),
        ATI Radeon X800SE (R423) UK (PCIE),
        ATI Radeon X800 XTP (R430) (PCIE), ATI Radeon X800 XL (R430) (PCIE),
        ATI Radeon X800 SE (R430) (PCIE), ATI Radeon X800 (R430) (PCIE),
        ATI FireGL V7100 (R423) (PCIE), ATI FireGL V5100 (R423) UQ (PCIE),
        ATI FireGL unknown (R423) UR (PCIE),
        ATI FireGL unknown (R423) UT (PCIE),
        ATI Mobility FireGL V5000 (M26) (PCIE),
        ATI Mobility FireGL V5000 (M26) (PCIE),
        ATI Mobility Radeon X700 XL (M26) (PCIE),
        ATI Mobility Radeon X700 (M26) (PCIE),
        ATI Mobility Radeon X700 (M26) (PCIE),
        ATI Radeon X550XTX 5657 (PCIE), ATI Radeon 9100 IGP (A5) 5834,
        ATI Radeon Mobility 9100 IGP (U3) 5835,
        ATI Radeon XPRESS 200 5954 (PCIE),
        ATI Radeon XPRESS 200M 5955 (PCIE), ATI Radeon 9250 5960 (AGP),
        ATI Radeon 9200 5961 (AGP), ATI Radeon 9200 5962 (AGP),
        ATI Radeon 9200SE 5964 (AGP), ATI FireMV 2200 (PCI),
        ATI ES1000 5969 (PCI), ATI Radeon XPRESS 200 5974 (PCIE),
        ATI Radeon XPRESS 200M 5975 (PCIE),
        ATI Radeon XPRESS 200 5A41 (PCIE),
        ATI Radeon XPRESS 200M 5A42 (PCIE),
        ATI Radeon XPRESS 200 5A61 (PCIE),
        ATI Radeon XPRESS 200M 5A62 (PCIE),
        ATI Radeon X300 (RV370) 5B60 (PCIE),
        ATI Radeon X600 (RV370) 5B62 (PCIE),
        ATI Radeon X550 (RV370) 5B63 (PCIE),
        ATI FireGL V3100 (RV370) 5B64 (PCIE),
        ATI FireMV 2200 PCIE (RV370) 5B65 (PCIE),
        ATI Radeon Mobility 9200 (M9+) 5C61 (AGP),
        ATI Radeon Mobility 9200 (M9+) 5C63 (AGP),
        ATI Mobility Radeon X800 XT (M28) (PCIE),
        ATI Mobility FireGL V5100 (M28) (PCIE),
        ATI Mobility Radeon X800 (M28) (PCIE), ATI Radeon X850 5D4C (PCIE),
        ATI Radeon X850 XT PE (R480) (PCIE),
        ATI Radeon X850 SE (R480) (PCIE), ATI Radeon X850 PRO (R480) (PCIE),
        ATI unknown Radeon / FireGL (R480) 5D50 (PCIE),
        ATI Radeon X850 XT (R480) (PCIE),
        ATI Radeon X800XT (R423) 5D57 (PCIE),
        ATI FireGL V5000 (RV410) (PCIE), ATI Radeon X700 XT (RV410) (PCIE),
        ATI Radeon X700 PRO (RV410) (PCIE),
        ATI Radeon X700 SE (RV410) (PCIE), ATI Radeon X700 (RV410) (PCIE),
        ATI Radeon X700 SE (RV410) (PCIE), ATI Radeon X1800,
        ATI Mobility Radeon X1800 XT, ATI Mobility Radeon X1800,
        ATI Mobility FireGL V7200, ATI FireGL V7200, ATI FireGL V5300,
        ATI Mobility FireGL V7100, ATI Radeon X1800, ATI Radeon X1800,
        ATI Radeon X1800, ATI Radeon X1800, ATI Radeon X1800,
        ATI FireGL V7300, ATI FireGL V7350, ATI Radeon X1600, ATI RV505,
        ATI Radeon X1300/X1550, ATI Radeon X1550, ATI M54-GL,
        ATI Mobility Radeon X1400, ATI Radeon X1300/X1550,
        ATI Radeon X1550 64-bit, ATI Mobility Radeon X1300,
        ATI Mobility Radeon X1300, ATI Mobility Radeon X1300,
        ATI Mobility Radeon X1300, ATI Radeon X1300, ATI Radeon X1300,
        ATI RV505, ATI RV505, ATI FireGL V3300, ATI FireGL V3350,
        ATI Radeon X1300, ATI Radeon X1550 64-bit, ATI Radeon X1300/X1550,
        ATI Radeon X1600, ATI Radeon X1300/X1550, ATI Mobility Radeon X1450,
        ATI Radeon X1300/X1550, ATI Mobility Radeon X2300,
        ATI Mobility Radeon X2300, ATI Mobility Radeon X1350,
        ATI Mobility Radeon X1350, ATI Mobility Radeon X1450,
        ATI Radeon X1300, ATI Radeon X1550, ATI Mobility Radeon X1350,
        ATI FireMV 2250, ATI Radeon X1550 64-bit, ATI Radeon X1600,
        ATI Radeon X1650, ATI Radeon X1600, ATI Radeon X1600,
        ATI Mobility FireGL V5200, ATI Mobility Radeon X1600,
        ATI Radeon X1650, ATI Radeon X1650, ATI Radeon X1600,
        ATI Radeon X1300 XT/X1600 Pro, ATI FireGL V3400,
        ATI Mobility FireGL V5250, ATI Mobility Radeon X1700,
        ATI Mobility Radeon X1700 XT, ATI FireGL V5200,
        ATI Mobility Radeon X1700, ATI Radeon X2300HD,
        ATI Mobility Radeon HD 2300, ATI Mobility Radeon HD 2300,
        ATI Radeon X1950, ATI Radeon X1900, ATI Radeon X1950,
        ATI Radeon X1900, ATI Radeon X1900, ATI Radeon X1900,
        ATI Radeon X1900, ATI Radeon X1900, ATI Radeon X1900,
        ATI Radeon X1900, ATI Radeon X1900, ATI Radeon X1900,
        ATI AMD Stream Processor, ATI Radeon X1900, ATI Radeon X1950,
        ATI RV560, ATI RV560, ATI Mobility Radeon X1900, ATI RV560,
        ATI Radeon X1950 GT, ATI RV570, ATI RV570, ATI FireGL V7400,
        ATI RV560, ATI Radeon X1650, ATI Radeon X1650, ATI RV560,
        ATI Radeon 9100 PRO IGP 7834, ATI Radeon Mobility 9200 IGP 7835,
        ATI Radeon X1200, ATI Radeon X1200, ATI Radeon X1200,
        ATI Radeon X1200, ATI Radeon X1200, ATI RS740, ATI RS740M, ATI RS740,
        ATI RS740M, ATI Radeon HD 2900 XT, ATI Radeon HD 2900 XT,
        ATI Radeon HD 2900 XT, ATI Radeon HD 2900 Pro, ATI Radeon HD 2900 GT,
        ATI FireGL V8650, ATI FireGL V8600, ATI FireGL V7600,
        ATI Radeon 4800 Series, ATI Radeon HD 4870 x2,
        ATI Radeon 4800 Series, ATI Radeon HD 4850 x2,
        ATI FirePro V8750 (FireGL), ATI FirePro V7760 (FireGL),
        ATI Mobility RADEON HD 4850, ATI Mobility RADEON HD 4850 X2,
        ATI Radeon 4800 Series, ATI FirePro RV770, AMD FireStream 9270,
        AMD FireStream 9250, ATI FirePro V8700 (FireGL),
        ATI Mobility RADEON HD 4870, ATI Mobility RADEON M98,
        ATI Mobility RADEON HD 4870, ATI Radeon 4800 Series,
        ATI Radeon 4800 Series, ATI FirePro M7750, ATI M98, ATI M98, ATI M98,
        ATI Mobility Radeon HD 4650, ATI Radeon RV730 (AGP),
        ATI Mobility Radeon HD 4670, ATI FirePro M5750,
        ATI Mobility Radeon HD 4670, ATI Radeon RV730 (AGP),
        ATI RV730XT [Radeon HD 4670], ATI RADEON E4600,
        ATI Radeon HD 4600 Series, ATI RV730 PRO [Radeon HD 4650],
        ATI FirePro V7750 (FireGL), ATI FirePro V5700 (FireGL),
        ATI FirePro V3750 (FireGL), ATI Mobility Radeon HD 4830,
        ATI Mobility Radeon HD 4850, ATI FirePro M7740, ATI RV740,
        ATI Radeon HD 4770, ATI Radeon HD 4700 Series, ATI Radeon HD 4770,
        ATI FirePro M5750, ATI RV610, ATI Radeon HD 2400 XT,
        ATI Radeon HD 2400 Pro, ATI Radeon HD 2400 PRO AGP, ATI FireGL V4000,
        ATI RV610, ATI Radeon HD 2350, ATI Mobility Radeon HD 2400 XT,
        ATI Mobility Radeon HD 2400, ATI RADEON E2400, ATI RV610,
        ATI FireMV 2260, ATI RV670, ATI Radeon HD3870,
        ATI Mobility Radeon HD 3850, ATI Radeon HD3850,
        ATI Mobility Radeon HD 3850 X2, ATI RV670,
        ATI Mobility Radeon HD 3870, ATI Mobility Radeon HD 3870 X2,
        ATI Radeon HD3870 X2, ATI FireGL V7700, ATI Radeon HD3850,
        ATI Radeon HD3690, AMD Firestream 9170, ATI Radeon HD 4550,
        ATI Radeon RV710, ATI Radeon RV710, ATI Radeon RV710,
        ATI Radeon HD 4350, ATI Mobility Radeon 4300 Series,
        ATI Mobility Radeon 4500 Series, ATI Mobility Radeon 4500 Series,
        ATI FirePro RG220, ATI Mobility Radeon 4330, ATI RV630,
        ATI Mobility Radeon HD 2600, ATI Mobility Radeon HD 2600 XT,
        ATI Radeon HD 2600 XT AGP, ATI Radeon HD 2600 Pro AGP,
        ATI Radeon HD 2600 XT, ATI Radeon HD 2600 Pro, ATI Gemini RV630,
        ATI Gemini Mobility Radeon HD 2600 XT, ATI FireGL V5600,
        ATI FireGL V3600, ATI Radeon HD 2600 LE,
        ATI Mobility FireGL Graphics Processor, ATI Radeon HD 3470,
        ATI Mobility Radeon HD 3430, ATI Mobility Radeon HD 3400 Series,
        ATI Radeon HD 3450, ATI Radeon HD 3450, ATI Radeon HD 3430,
        ATI Radeon HD 3450, ATI FirePro V3700, ATI FireMV 2450,
        ATI FireMV 2260, ATI FireMV 2260, ATI Radeon HD 3600 Series,
        ATI Radeon HD 3650 AGP, ATI Radeon HD 3600 PRO,
        ATI Radeon HD 3600 XT, ATI Radeon HD 3600 PRO,
        ATI Mobility Radeon HD 3650, ATI Mobility Radeon HD 3670,
        ATI Mobility FireGL V5700, ATI Mobility FireGL V5725,
        ATI Radeon HD 3200 Graphics, ATI Radeon 3100 Graphics,
        ATI Radeon HD 3200 Graphics, ATI Radeon 3100 Graphics,
        ATI Radeon HD 3300 Graphics, ATI Radeon HD 3200 Graphics,
        ATI Radeon 3000 Graphics, SUMO, SUMO, SUMO2, SUMO2, SUMO2, SUMO2,
        SUMO, SUMO, SUMO2, SUMO, SUMO, SUMO, SUMO, SUMO, ATI Radeon HD 4200,
        ATI Radeon 4100, ATI Mobility Radeon HD 4200,
        ATI Mobility Radeon 4100, ATI Radeon HD 4290, ATI Radeon HD 4250,
        AMD Radeon HD 6310 Graphics, AMD Radeon HD 6310 Graphics,
        AMD Radeon HD 6250 Graphics, AMD Radeon HD 6250 Graphics,
        AMD Radeon HD 6300 Series Graphics,
        AMD Radeon HD 6200 Series Graphics, PALM, PALM, PALM, CYPRESS,
        ATI FirePro (FireGL) Graphics Adapter,
        ATI FirePro (FireGL) Graphics Adapter,
        ATI FirePro (FireGL) Graphics Adapter, AMD Firestream 9370,
        AMD Firestream 9350, ATI Radeon HD 5800 Series,
        ATI Radeon HD 5800 Series, ATI Radeon HD 5800 Series,
        ATI Radeon HD 5800 Series, ATI Radeon HD 5900 Series,
        ATI Radeon HD 5900 Series, ATI Mobility Radeon HD 5800 Series,
        ATI Mobility Radeon HD 5800 Series,
        ATI FirePro (FireGL) Graphics Adapter,
        ATI FirePro (FireGL) Graphics Adapter,
        ATI Mobility Radeon HD 5800 Series, ATI Radeon HD 5700 Series,
        ATI Radeon HD 5700 Series, ATI Radeon HD 6700 Series,
        ATI Radeon HD 5700 Series, ATI Radeon HD 6700 Series,
        ATI Mobility Radeon HD 5000 Series,
        ATI Mobility Radeon HD 5000 Series, ATI Mobility Radeon HD 5570,
        ATI FirePro (FireGL) Graphics Adapter,
        ATI FirePro (FireGL) Graphics Adapter, ATI Radeon HD 5670,
        ATI Radeon HD 5570, ATI Radeon HD 5500 Series, REDWOOD,
        ATI Mobility Radeon HD 5000 Series,
        ATI Mobility Radeon HD 5000 Series, ATI Mobility Radeon Graphics,
        ATI Mobility Radeon Graphics, CEDAR,
        ATI FirePro (FireGL) Graphics Adapter,
        ATI FirePro (FireGL) Graphics Adapter, ATI FirePro 2270, CEDAR,
        ATI Radeon HD 5450, CEDAR, CEDAR, CAYMAN, CAYMAN, CAYMAN, CAYMAN,
        CAYMAN, CAYMAN, CAYMAN, CAYMAN, CAYMAN, CAYMAN,
        AMD Radeon HD 6900 Series, AMD Radeon HD 6900 Series, CAYMAN, CAYMAN,
        CAYMAN, AMD Radeon HD 6900M Series, Mobility Radeon HD 6000 Series,
        BARTS, BARTS, Mobility Radeon HD 6000 Series,
        Mobility Radeon HD 6000 Series, BARTS, BARTS, BARTS, BARTS,
        AMD Radeon HD 6800 Series, AMD Radeon HD 6800 Series,
        AMD Radeon HD 6700 Series, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS,
        TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS,
        TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS,
        CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS,
        CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, ARUBA, ARUBA,
        ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA,
        ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA,
        ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA,
        ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, TAHITI, TAHITI, TAHITI, TAHITI,
        TAHITI, TAHITI, TAHITI, TAHITI, TAHITI, TAHITI, TAHITI, TAHITI,
        TAHITI, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN,
        PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN,
        VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE,
        VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE,
        VERDE, VERDE, VERDE, VERDE, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND,
        OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND,
        HAINAN, HAINAN, HAINAN, HAINAN, HAINAN, HAINAN, BONAIRE, BONAIRE,
        BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE,
        BONAIRE, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI,
        KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI,
        KABINI, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS,
        MULLINS, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS,
        MULLINS, MULLINS, MULLINS, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
        KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
        KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
        KAVERI, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII,
        HAWAII, HAWAII, HAWAII, HAWAII, HAWAII
[ 69158.589] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 69158.589] (II) FBDEV: driver for framebuffer: fbdev
[ 69158.589] (II) VESA: driver for VESA chipsets: vesa
[ 69158.589] (II) [KMS] Kernel modesetting enabled.
[ 69158.589] (WW) Falling back to old probe method for modesetting
[ 69158.589] (WW) Falling back to old probe method for fbdev
[ 69158.589] (II) Loading sub module "fbdevhw"
[ 69158.589] (II) LoadModule: "fbdevhw"
[ 69158.589] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 69158.589] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 69158.589]    compiled for 1.17.1, module version = 0.0.2
[ 69158.589]    ABI class: X.Org Video Driver, version 19.0
[ 69158.589] (WW) Falling back to old probe method for vesa
[ 69158.589] (II) RADEON(0): Creating default Display subsection in Screen 
section
        "Default Screen Section" for depth/fbbpp 24/32
[ 69158.589] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
[ 69158.589] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp 
pixmaps)
[ 69158.589] (==) RADEON(0): Default visual is TrueColor
[ 69158.589] (==) RADEON(0): RGB weight 888
[ 69158.589] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
[ 69158.589] (--) RADEON(0): Chipset: "TAHITI" (ChipID = 0x679a)
[ 69158.590] (EE) RADEON(0): [drm] failed to set drm interface version.
[ 69158.590] (EE) RADEON(0): Kernel modesetting setup failed
[ 69158.590] (II) UnloadModule: "radeon"
[ 69158.590] (EE) Screen(s) found, but none have a usable configuration.
[ 69158.590] (EE)
Fatal server error:
[ 69158.590] (EE) no screens found(EE)
[ 69158.590] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[ 69158.590] (EE) Please also check the log file at "/var/log/Xorg.1.log" for 
additional information.
[ 69158.590] (EE)
[ 69158.590] (EE) Server terminated with error (1). Closing log file.

here is my lightdm.conf, only logind-check-graphical is enabled

➜  ~  cat /etc/lightdm/lightdm.conf
#
# General configuration
#
# start-default-seat = True to always start one seat if none are defined in the 
configuration
# greeter-user = User to run greeter as
# minimum-display-number = Minimum display number to use for X servers
# minimum-vt = First VT to run displays on
# lock-memory = True to prevent memory from being paged to disk
# user-authority-in-system-dir = True if session authority should be in the 
system location
# guest-account-script = Script to be run to setup guest account
# logind-check-graphical = True to on start seats that are marked as graphical 
by logind
# log-directory = Directory to log information to
# run-directory = Directory to put running state in
# cache-directory = Directory to cache to
# sessions-directory = Directory to find sessions
# remote-sessions-directory = Directory to find remote sessions
# greeters-directory = Directory to find greeters
#
[LightDM]
#start-default-seat=true
#greeter-user=lightdm
#minimum-display-number=0
#minimum-vt=7
#lock-memory=true
#user-authority-in-system-dir=false
#guest-account-script=guest-account
logind-check-graphical=true
#log-directory=/var/log/lightdm
#run-directory=/var/run/lightdm
#cache-directory=/var/cache/lightdm
#sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions
#remote-sessions-directory=/usr/share/lightdm/remote-sessions
#greeters-directory=/usr/share/lightdm/greeters:/usr/share/xgreeters

#
# Seat defaults
#
# type = Seat type (xlocal, xremote)
# pam-service = PAM service to use for login
# pam-autologin-service = PAM service to use for autologin
# pam-greeter-service = PAM service to use for greeters
# xserver-command = X server command to run (can also contain arguments e.g. X 
-special-option)
# xserver-layout = Layout to pass to X server
# xserver-config = Config file to pass to X server
# xserver-allow-tcp = True if TCP/IP connections are allowed to this X server
# xserver-share = True if the X server is shared for both greeter and session
# xserver-hostname = Hostname of X server (only for type=xremote)
# xserver-display-number = Display number of X server (only for type=xremote)
# xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
# xdmcp-port = XDMCP UDP/IP port to communicate on
# xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in 
keys.conf)
# unity-compositor-command = Unity compositor command to run (can also contain 
arguments e.g. unity-system-compositor -special-option)
# unity-compositor-timeout = Number of seconds to wait for compositor to start
# greeter-session = Session to load for greeter
# greeter-hide-users = True to hide the user list
# greeter-allow-guest = True if the greeter should show a guest login option
# greeter-show-manual-login = True if the greeter should offer a manual login 
option
# greeter-show-remote-login = True if the greeter should offer a remote login 
option
# user-session = Session to load for users
# allow-user-switching = True if allowed to switch users
# allow-guest = True if guest login is allowed
# guest-session = Session to load for guests (overrides user-session)
# session-wrapper = Wrapper script to run session with
# greeter-wrapper = Wrapper script to run greeter with
# guest-wrapper = Wrapper script to run guest sessions with
# display-setup-script = Script to run when starting a greeter session (runs as 
root)
# display-stopped-script = Script to run after stopping the display server 
(runs as root)
# greeter-setup-script = Script to run when starting a greeter (runs as root)
# session-setup-script = Script to run when starting a user session (runs as 
root)
# session-cleanup-script = Script to run when quitting a user session (runs as 
root)
# autologin-guest = True to log in as guest by default
# autologin-user = User to log in with by default (overrides autologin-guest)
# autologin-user-timeout = Number of seconds to wait before loading default user
# autologin-session = Session to load for automatic login (overrides 
user-session)
# autologin-in-background = True if autologin session should not be immediately 
activated
# exit-on-failure = True if the daemon should exit if this seat fails
#
[SeatDefaults]
#type=xlocal
#pam-service=lightdm
#pam-autologin-service=lightdm-autologin
#pam-greeter-service=lightdm-greeter
#xserver-command=X
#xserver-layout=
#xserver-config=
#xserver-allow-tcp=false
#xserver-share=true
#xserver-hostname=
#xserver-display-number=
#xdmcp-manager=
#xdmcp-port=177
#xdmcp-key=
#unity-compositor-command=unity-system-compositor
#unity-compositor-timeout=60
#greeter-session=example-gtk-gnome
#greeter-hide-users=false
#greeter-allow-guest=true
#greeter-show-manual-login=false
#greeter-show-remote-login=true
#user-session=default
#allow-user-switching=true
#allow-guest=true
#guest-session=
#session-wrapper=lightdm-session
#greeter-wrapper=
#guest-wrapper=
#display-setup-script=
#display-stopped-script=
#greeter-setup-script=
#session-setup-script=
#session-cleanup-script=
#autologin-guest=false
#autologin-user=
#autologin-user-timeout=0
#autologin-in-background=false
#autologin-session=UNIMPLEMENTED
#exit-on-failure=false

#
# Seat configuration
#
# Each seat must start with "Seat:".
# Uses settings from [SeatDefaults], any of these can be overriden by setting 
them in this section.
#
#[Seat:0]

#
# XDMCP Server configuration
#
# enabled = True if XDMCP connections should be allowed
# port = UDP/IP port to listen for connections on
# key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use 
authentication (stored in keys.conf)
#
# The authentication key is a 56 bit DES key specified in hex as 
0xnnnnnnnnnnnnnn.  Alternatively
# it can be a word and the first 7 characters are used as the key.
#
[XDMCPServer]
#enabled=false
#port=177
#key=

#
# VNC Server configuration
#
# enabled = True if VNC connections should be allowed
# command = Command to run Xvnc server with
# port = TCP/IP port to listen for connections on
# width = Width of display to use
# height = Height of display to use
# depth = Color depth of display to use
#
[VNCServer]
#enabled=false
#command=Xvnc
#port=5900
#width=1024
#height=768
#depth=8

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1458869

Title:
  multiseat doesn't work after upgrading to 1.14

Status in lightdm package in Ubuntu:
  New

Bug description:
  I read that from 1.10 to 1.14 things changed and that i need to use logind. 
So I removed files that were working with lightdm 1.10 and tried to set it up 
the "logind" way.
  I removed my xorg.conf and got a bare lightdm.conf (see below)
  Am I overlooking something obvious that prevent the second X server to launch 
properly like it used to with version 1.10 ?

  thanks

  I got 2 GPU, 2 screens.
  I configured logind that way :
  loginctl attach seat-1 
/sys/devices/pci0000:00/0000:00:07.0/0000:03:00.0/drm/card1
  loginctl attach seat-1 
/sys/devices/pci0000:00/0000:00:07.0/0000:03:00.0/graphics/fb1
  loginctl attach seat-1 
/sys/devices/pci0000:00/0000:00:07.0/0000:03:00.1/sound/card2
  loginctl attach seat-1 /sys/devices/pci0000:00/0000:00:1d.2/usb8

  resulting in those udev rules :
  cat /etc/udev/rules.d/72-seat-drm-pci-0000_03_00_0.rules 
/etc/udev/rules.d/72-seat-graphics-pci-0000_03_00_0.rules 
/etc/udev/rules.d/72-seat-sound-pci-0000_03_00_1.rules 
/etc/udev/rules.d/72-seat-usb-pci-0000_00_1d_2.rules

  TAG=="seat", ENV{ID_FOR_SEAT}=="drm-pci-0000_03_00_0", ENV{ID_SEAT}="seat-1"
  TAG=="seat", ENV{ID_FOR_SEAT}=="graphics-pci-0000_03_00_0", 
ENV{ID_SEAT}="seat-1"
  TAG=="seat", ENV{ID_FOR_SEAT}=="sound-pci-0000_03_00_1", ENV{ID_SEAT}="seat-1"
  TAG=="seat", ENV{ID_FOR_SEAT}=="usb-pci-0000_00_1d_2", ENV{ID_SEAT}="seat-1"

  well now only one seat is working :
  [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
  [+0.00s] DEBUG: Starting Light Display Manager 1.14.0, UID=0 PID=12879
  [+0.00s] DEBUG: Loading configuration dirs from 
/usr/share/lightdm/lightdm.conf.d
  [+0.00s] DEBUG: Loading configuration from 
/usr/share/lightdm/lightdm.conf.d/01_debian.conf
  [+0.00s] DEBUG: Loading configuration dirs from 
/usr/local/share/lightdm/lightdm.conf.d
  [+0.00s] DEBUG: Loading configuration dirs from 
/etc/xdg/lightdm/lightdm.conf.d
  [+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
  [+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
  [+0.00s] DEBUG: Registered seat module xlocal
  [+0.00s] DEBUG: Registered seat module xremote
  [+0.00s] DEBUG: Registered seat module unity
  [+0.01s] DEBUG: Monitoring logind for seats
  [+0.01s] DEBUG: New seat added from logind: seat0
  [+0.01s] DEBUG: Loading properties from config section SeatDefaults
  [+0.01s] DEBUG: Seat seat0: Starting
  [+0.01s] DEBUG: Seat seat0: Creating greeter session
  [+0.01s] DEBUG: Seat seat0: Creating display server of type x
  [+0.01s] DEBUG: Could not run plymouth --ping: Failed to execute child 
process "plymouth" (No such file or directory)
  [+0.01s] DEBUG: Using VT 7
  [+0.01s] DEBUG: Seat seat0: Starting local X display on VT 7
  [+0.01s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
  [+0.01s] DEBUG: DisplayServer x-0: Writing X server authority to 
/var/run/lightdm/root/:0
  [+0.01s] DEBUG: DisplayServer x-0: Launching X Server
  [+0.01s] DEBUG: Launching process 12883: /usr/bin/X :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
  [+0.01s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
  [+0.01s] DEBUG: New seat added from logind: seat-1
  [+0.01s] DEBUG: Loading properties from config section SeatDefaults
  [+0.01s] DEBUG: Seat seat-1 has property CanMultiSession=no
  [+0.01s] DEBUG: Seat seat-1: Starting
  [+0.01s] DEBUG: Seat seat-1: Creating greeter session
  [+0.01s] DEBUG: Seat seat-1: Creating display server of type x
  [+0.01s] DEBUG: Seat seat-1: Starting local X display
  [+0.01s] DEBUG: DisplayServer x-1: Logging to /var/log/lightdm/x-1.log
  [+0.01s] DEBUG: DisplayServer x-1: Writing X server authority to 
/var/run/lightdm/root/:1
  [+0.01s] DEBUG: DisplayServer x-1: Launching X Server
  [+0.01s] DEBUG: Launching process 12885: /usr/bin/X :1 -seat seat-1 -sharevts 
-auth /var/run/lightdm/root/:1 -nolisten tcp
  [+0.01s] DEBUG: DisplayServer x-1: Waiting for ready signal from X server :1
  [+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
  [+0.01s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat0
  [+0.01s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat1
  [+0.01s] WARNING: Error getting user list from org.freedesktop.Accounts: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
org.freedesktop.Accounts was not provided by any .service files
  [+0.01s] DEBUG: Loading user config from /etc/lightdm/users.conf
  [+0.01s] DEBUG: User clarisse added
  [+0.01s] DEBUG: User lotso added
  [+0.01s] DEBUG: User max added
  [+0.03s] DEBUG: Process 12885 exited with return value 1
  [+0.03s] DEBUG: DisplayServer x-1: X server stopped
  [+0.03s] DEBUG: DisplayServer x-1: Removing X server authority 
/var/run/lightdm/root/:1
  [+0.03s] DEBUG: Seat seat-1: Display server stopped
  [+0.03s] DEBUG: Seat seat-1: Stopping; greeter display server failed to start
  [+0.03s] DEBUG: Seat seat-1: Stopping
  [+0.03s] DEBUG: Seat seat-1: Stopping session
  [+0.03s] DEBUG: Seat seat-1: Session stopped
  [+0.03s] DEBUG: Seat seat-1: Stopped
  [+0.03s] DEBUG: Seat seat-1: Stopping session
  [+0.78s] DEBUG: Got signal 10 from process 12883
  [+0.78s] DEBUG: DisplayServer x-0: Got signal from X server :0
  [+0.78s] DEBUG: DisplayServer x-0: Connecting to XServer :0
  [+0.78s] DEBUG: Seat seat0: Display server ready, starting session 
authentication
  [+0.78s] DEBUG: Session pid=12901: Started with service 'lightdm-greeter', 
username 'lightdm'
  [+0.79s] DEBUG: Session pid=12901: Authentication complete with return value 
0: Success
  [+0.79s] DEBUG: Seat seat0: Session authenticated, running command
  [+0.79s] DEBUG: Session pid=12901: Running command 
/usr/sbin/lightdm-gtk-greeter
  [+0.79s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
  [+0.79s] DEBUG: Session pid=12901: Logging to /var/log/lightdm/x-0-greeter.log
  [+0.80s] DEBUG: Activating VT 7
  [+0.80s] DEBUG: Activating login1 session c33
  [+0.80s] DEBUG: Seat seat0 changes active session to c33
  [+0.81s] DEBUG: Session c33 is already active
  [+0.86s] DEBUG: Session pid=12901: Greeter connected version=1.14.0 
resettable=false
  [+1.13s] DEBUG: Session pid=12901: Greeter start authentication
  [+1.13s] DEBUG: Session pid=12920: Started with service 'lightdm', username 
'(null)'
  [+1.14s] DEBUG: Session pid=12920: Got 1 message(s) from PAM
  [+1.14s] DEBUG: Session pid=12901: Prompt greeter with 1 message(s)

  
  lightdm seems to get that there is another seat, but the X server crashes :
  ➜  ~  sudo cat /var/log/Xorg.1.log
  [ 69158.578]
  X.Org X Server 1.17.1
  Release Date: 2015-02-10
  [ 69158.578] X Protocol Version 11, Revision 0
  [ 69158.578] Build Operating System: Linux 3.16.0-4-amd64 x86_64 Debian
  [ 69158.578] Current Operating System: Linux bigbenn 4.0.0-1-amd64 #1 SMP 
Debian 4.0.2-1 (2015-05-11) x86_64
  [ 69158.578] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.0.0-1-amd64 
root=UUID=eb1bf56f-7f1a-4397-b66b-7d5a5f07bd49 ro quiet
  [ 69158.578] Build Date: 04 May 2015  11:22:06PM
  [ 69158.578] xorg-server 2:1.17.1-2 (http://www.debian.org/support)
  [ 69158.578] Current version of pixman: 0.32.6
  [ 69158.578]    Before reporting problems, check http://wiki.x.org
          to make sure that you have the latest version.
  [ 69158.578] Markers: (--) probed, (**) from config file, (==) default 
setting,
          (++) from command line, (!!) notice, (II) informational,
          (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
  [ 69158.578] (==) Log file: "/var/log/Xorg.1.log", Time: Tue May 26 14:32:44 
2015
  [ 69158.578] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
  [ 69158.578] (==) No Layout section.  Using the first Screen section.
  [ 69158.578] (==) No screen section available. Using defaults.
  [ 69158.578] (**) |-->Screen "Default Screen Section" (0)
  [ 69158.578] (**) |   |-->Monitor "<default monitor>"
  [ 69158.578] (==) No monitor specified for screen "Default Screen Section".
          Using a default monitor configuration.
  [ 69158.578] (==) Automatically adding devices
  [ 69158.578] (==) Automatically enabling devices
  [ 69158.578] (==) Automatically adding GPU devices
  [ 69158.578] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not 
exist.
  [ 69158.578]    Entry deleted from font path.
  [ 69158.578] (==) FontPath set to:
          /usr/share/fonts/X11/misc,
          /usr/share/fonts/X11/100dpi/:unscaled,
          /usr/share/fonts/X11/75dpi/:unscaled,
          /usr/share/fonts/X11/Type1,
          /usr/share/fonts/X11/100dpi,
          /usr/share/fonts/X11/75dpi,
          built-ins
  [ 69158.578] (==) ModulePath set to "/usr/lib/xorg/modules"
  [ 69158.578] (II) The server relies on udev to provide the list of input 
devices.
          If no devices become available, reconfigure udev or disable 
AutoAddDevices.
  [ 69158.578] (II) Loader magic: 0x7f2a03704d80
  [ 69158.578] (II) Module ABI versions:
  [ 69158.578]    X.Org ANSI C Emulation: 0.4
  [ 69158.578]    X.Org Video Driver: 19.0
  [ 69158.578]    X.Org XInput driver : 21.0
  [ 69158.578]    X.Org Server Extension : 9.0
  [ 69158.579] (II) xfree86: Adding drm device (/dev/dri/card1)
  [ 69158.581] (II) LoadModule: "glx"
  [ 69158.581] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
  [ 69158.582] (II) Module glx: vendor="X.Org Foundation"
  [ 69158.582]    compiled for 1.17.1, module version = 1.0.0
  [ 69158.582]    ABI class: X.Org Server Extension, version 9.0
  [ 69158.582] (==) AIGLX enabled
  [ 69158.582] (==) Matched ati as autoconfigured driver 0
  [ 69158.582] (==) Matched ati as autoconfigured driver 1
  [ 69158.582] (==) Matched modesetting as autoconfigured driver 2
  [ 69158.582] (==) Matched fbdev as autoconfigured driver 3
  [ 69158.582] (==) Matched vesa as autoconfigured driver 4
  [ 69158.582] (==) Assigned the driver to the xf86ConfigLayout
  [ 69158.582] (II) LoadModule: "ati"
  [ 69158.583] (II) Loading /usr/lib/xorg/modules/drivers/ati_drv.so
  [ 69158.583] (II) Module ati: vendor="X.Org Foundation"
  [ 69158.583]    compiled for 1.17.1, module version = 7.5.0
  [ 69158.583]    Module class: X.Org Video Driver
  [ 69158.583]    ABI class: X.Org Video Driver, version 19.0
  [ 69158.583] (II) LoadModule: "radeon"
  [ 69158.583] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
  [ 69158.584] (II) Module radeon: vendor="X.Org Foundation"
  [ 69158.584]    compiled for 1.17.1, module version = 7.5.0
  [ 69158.584]    Module class: X.Org Video Driver
  [ 69158.584]    ABI class: X.Org Video Driver, version 19.0
  [ 69158.584] (II) LoadModule: "modesetting"
  [ 69158.584] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
  [ 69158.584] (II) Module modesetting: vendor="X.Org Foundation"
  [ 69158.584]    compiled for 1.17.1, module version = 1.17.1
  [ 69158.584]    Module class: X.Org Video Driver
  [ 69158.584]    ABI class: X.Org Video Driver, version 19.0
  [ 69158.584] (II) LoadModule: "fbdev"
  [ 69158.584] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
  [ 69158.584] (II) Module fbdev: vendor="X.Org Foundation"
  [ 69158.584]    compiled for 1.17.1, module version = 0.4.4
  [ 69158.584]    Module class: X.Org Video Driver
  [ 69158.584]    ABI class: X.Org Video Driver, version 19.0
  [ 69158.584] (II) LoadModule: "vesa"
  [ 69158.585] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
  [ 69158.585] (II) Module vesa: vendor="X.Org Foundation"
  [ 69158.585]    compiled for 1.17.1, module version = 2.3.3
  [ 69158.585]    Module class: X.Org Video Driver
  [ 69158.585]    ABI class: X.Org Video Driver, version 19.0
  [ 69158.585] (II) RADEON: Driver for ATI Radeon chipsets:
          ATI Radeon Mobility X600 (M24) 3150 (PCIE), ATI FireMV 2400 (PCI),
          ATI Radeon Mobility X300 (M24) 3152 (PCIE),
          ATI FireGL M24 GL 3154 (PCIE), ATI FireMV 2400 3155 (PCI),
          ATI Radeon X600 (RV380) 3E50 (PCIE),
          ATI FireGL V3200 (RV380) 3E54 (PCIE), ATI Radeon IGP320 (A3) 4136,
          ATI Radeon IGP330/340/350 (A4) 4137, ATI Radeon 9500 AD (AGP),
          ATI Radeon 9500 AE (AGP), ATI Radeon 9600TX AF (AGP),
          ATI FireGL Z1 AG (AGP), ATI Radeon 9800SE AH (AGP),
          ATI Radeon 9800 AI (AGP), ATI Radeon 9800 AJ (AGP),
          ATI FireGL X2 AK (AGP), ATI Radeon 9600 AP (AGP),
          ATI Radeon 9600SE AQ (AGP), ATI Radeon 9600XT AR (AGP),
          ATI Radeon 9600 AS (AGP), ATI FireGL T2 AT (AGP), ATI Radeon 9650,
          ATI FireGL RV360 AV (AGP), ATI Radeon 7000 IGP (A4+) 4237,
          ATI Radeon 8500 AIW BB (AGP), ATI Radeon IGP320M (U1) 4336,
          ATI Radeon IGP330M/340M/350M (U2) 4337,
          ATI Radeon Mobility 7000 IGP 4437, ATI Radeon 9000/PRO If (AGP/PCI),
          ATI Radeon 9000 Ig (AGP/PCI), ATI Radeon X800 (R420) JH (AGP),
          ATI Radeon X800PRO (R420) JI (AGP),
          ATI Radeon X800SE (R420) JJ (AGP), ATI Radeon X800 (R420) JK (AGP),
          ATI Radeon X800 (R420) JL (AGP), ATI FireGL X3 (R420) JM (AGP),
          ATI Radeon Mobility 9800 (M18) JN (AGP),
          ATI Radeon X800 SE (R420) (AGP), ATI Radeon X800XT (R420) JP (AGP),
          ATI Radeon X800 VE (R420) JT (AGP), ATI Radeon X850 (R480) (AGP),
          ATI Radeon X850 XT (R480) (AGP), ATI Radeon X850 SE (R480) (AGP),
          ATI Radeon X850 PRO (R480) (AGP), ATI Radeon X850 XT PE (R480) (AGP),
          ATI Radeon Mobility M7 LW (AGP),
          ATI Mobility FireGL 7800 M7 LX (AGP),
          ATI Radeon Mobility M6 LY (AGP), ATI Radeon Mobility M6 LZ (AGP),
          ATI FireGL Mobility 9000 (M9) Ld (AGP),
          ATI Radeon Mobility 9000 (M9) Lf (AGP),
          ATI Radeon Mobility 9000 (M9) Lg (AGP), ATI FireMV 2400 PCI,
          ATI Radeon 9700 Pro ND (AGP), ATI Radeon 9700/9500Pro NE (AGP),
          ATI Radeon 9600TX NF (AGP), ATI FireGL X1 NG (AGP),
          ATI Radeon 9800PRO NH (AGP), ATI Radeon 9800 NI (AGP),
          ATI FireGL X2 NK (AGP), ATI Radeon 9800XT NJ (AGP),
          ATI Radeon Mobility 9600/9700 (M10/M11) NP (AGP),
          ATI Radeon Mobility 9600 (M10) NQ (AGP),
          ATI Radeon Mobility 9600 (M11) NR (AGP),
          ATI Radeon Mobility 9600 (M10) NS (AGP),
          ATI FireGL Mobility T2 (M10) NT (AGP),
          ATI FireGL Mobility T2e (M11) NV (AGP), ATI Radeon QD (AGP),
          ATI Radeon QE (AGP), ATI Radeon QF (AGP), ATI Radeon QG (AGP),
          ATI FireGL 8700/8800 QH (AGP), ATI Radeon 8500 QL (AGP),
          ATI Radeon 9100 QM (AGP), ATI Radeon 7500 QW (AGP/PCI),
          ATI Radeon 7500 QX (AGP/PCI), ATI Radeon VE/7000 QY (AGP/PCI),
          ATI Radeon VE/7000 QZ (AGP/PCI), ATI ES1000 515E (PCI),
          ATI Radeon Mobility X300 (M22) 5460 (PCIE),
          ATI Radeon Mobility X600 SE (M24C) 5462 (PCIE),
          ATI FireGL M22 GL 5464 (PCIE), ATI Radeon X800 (R423) UH (PCIE),
          ATI Radeon X800PRO (R423) UI (PCIE),
          ATI Radeon X800LE (R423) UJ (PCIE),
          ATI Radeon X800SE (R423) UK (PCIE),
          ATI Radeon X800 XTP (R430) (PCIE), ATI Radeon X800 XL (R430) (PCIE),
          ATI Radeon X800 SE (R430) (PCIE), ATI Radeon X800 (R430) (PCIE),
          ATI FireGL V7100 (R423) (PCIE), ATI FireGL V5100 (R423) UQ (PCIE),
          ATI FireGL unknown (R423) UR (PCIE),
          ATI FireGL unknown (R423) UT (PCIE),
          ATI Mobility FireGL V5000 (M26) (PCIE),
          ATI Mobility FireGL V5000 (M26) (PCIE),
          ATI Mobility Radeon X700 XL (M26) (PCIE),
          ATI Mobility Radeon X700 (M26) (PCIE),
          ATI Mobility Radeon X700 (M26) (PCIE),
          ATI Radeon X550XTX 5657 (PCIE), ATI Radeon 9100 IGP (A5) 5834,
          ATI Radeon Mobility 9100 IGP (U3) 5835,
          ATI Radeon XPRESS 200 5954 (PCIE),
          ATI Radeon XPRESS 200M 5955 (PCIE), ATI Radeon 9250 5960 (AGP),
          ATI Radeon 9200 5961 (AGP), ATI Radeon 9200 5962 (AGP),
          ATI Radeon 9200SE 5964 (AGP), ATI FireMV 2200 (PCI),
          ATI ES1000 5969 (PCI), ATI Radeon XPRESS 200 5974 (PCIE),
          ATI Radeon XPRESS 200M 5975 (PCIE),
          ATI Radeon XPRESS 200 5A41 (PCIE),
          ATI Radeon XPRESS 200M 5A42 (PCIE),
          ATI Radeon XPRESS 200 5A61 (PCIE),
          ATI Radeon XPRESS 200M 5A62 (PCIE),
          ATI Radeon X300 (RV370) 5B60 (PCIE),
          ATI Radeon X600 (RV370) 5B62 (PCIE),
          ATI Radeon X550 (RV370) 5B63 (PCIE),
          ATI FireGL V3100 (RV370) 5B64 (PCIE),
          ATI FireMV 2200 PCIE (RV370) 5B65 (PCIE),
          ATI Radeon Mobility 9200 (M9+) 5C61 (AGP),
          ATI Radeon Mobility 9200 (M9+) 5C63 (AGP),
          ATI Mobility Radeon X800 XT (M28) (PCIE),
          ATI Mobility FireGL V5100 (M28) (PCIE),
          ATI Mobility Radeon X800 (M28) (PCIE), ATI Radeon X850 5D4C (PCIE),
          ATI Radeon X850 XT PE (R480) (PCIE),
          ATI Radeon X850 SE (R480) (PCIE), ATI Radeon X850 PRO (R480) (PCIE),
          ATI unknown Radeon / FireGL (R480) 5D50 (PCIE),
          ATI Radeon X850 XT (R480) (PCIE),
          ATI Radeon X800XT (R423) 5D57 (PCIE),
          ATI FireGL V5000 (RV410) (PCIE), ATI Radeon X700 XT (RV410) (PCIE),
          ATI Radeon X700 PRO (RV410) (PCIE),
          ATI Radeon X700 SE (RV410) (PCIE), ATI Radeon X700 (RV410) (PCIE),
          ATI Radeon X700 SE (RV410) (PCIE), ATI Radeon X1800,
          ATI Mobility Radeon X1800 XT, ATI Mobility Radeon X1800,
          ATI Mobility FireGL V7200, ATI FireGL V7200, ATI FireGL V5300,
          ATI Mobility FireGL V7100, ATI Radeon X1800, ATI Radeon X1800,
          ATI Radeon X1800, ATI Radeon X1800, ATI Radeon X1800,
          ATI FireGL V7300, ATI FireGL V7350, ATI Radeon X1600, ATI RV505,
          ATI Radeon X1300/X1550, ATI Radeon X1550, ATI M54-GL,
          ATI Mobility Radeon X1400, ATI Radeon X1300/X1550,
          ATI Radeon X1550 64-bit, ATI Mobility Radeon X1300,
          ATI Mobility Radeon X1300, ATI Mobility Radeon X1300,
          ATI Mobility Radeon X1300, ATI Radeon X1300, ATI Radeon X1300,
          ATI RV505, ATI RV505, ATI FireGL V3300, ATI FireGL V3350,
          ATI Radeon X1300, ATI Radeon X1550 64-bit, ATI Radeon X1300/X1550,
          ATI Radeon X1600, ATI Radeon X1300/X1550, ATI Mobility Radeon X1450,
          ATI Radeon X1300/X1550, ATI Mobility Radeon X2300,
          ATI Mobility Radeon X2300, ATI Mobility Radeon X1350,
          ATI Mobility Radeon X1350, ATI Mobility Radeon X1450,
          ATI Radeon X1300, ATI Radeon X1550, ATI Mobility Radeon X1350,
          ATI FireMV 2250, ATI Radeon X1550 64-bit, ATI Radeon X1600,
          ATI Radeon X1650, ATI Radeon X1600, ATI Radeon X1600,
          ATI Mobility FireGL V5200, ATI Mobility Radeon X1600,
          ATI Radeon X1650, ATI Radeon X1650, ATI Radeon X1600,
          ATI Radeon X1300 XT/X1600 Pro, ATI FireGL V3400,
          ATI Mobility FireGL V5250, ATI Mobility Radeon X1700,
          ATI Mobility Radeon X1700 XT, ATI FireGL V5200,
          ATI Mobility Radeon X1700, ATI Radeon X2300HD,
          ATI Mobility Radeon HD 2300, ATI Mobility Radeon HD 2300,
          ATI Radeon X1950, ATI Radeon X1900, ATI Radeon X1950,
          ATI Radeon X1900, ATI Radeon X1900, ATI Radeon X1900,
          ATI Radeon X1900, ATI Radeon X1900, ATI Radeon X1900,
          ATI Radeon X1900, ATI Radeon X1900, ATI Radeon X1900,
          ATI AMD Stream Processor, ATI Radeon X1900, ATI Radeon X1950,
          ATI RV560, ATI RV560, ATI Mobility Radeon X1900, ATI RV560,
          ATI Radeon X1950 GT, ATI RV570, ATI RV570, ATI FireGL V7400,
          ATI RV560, ATI Radeon X1650, ATI Radeon X1650, ATI RV560,
          ATI Radeon 9100 PRO IGP 7834, ATI Radeon Mobility 9200 IGP 7835,
          ATI Radeon X1200, ATI Radeon X1200, ATI Radeon X1200,
          ATI Radeon X1200, ATI Radeon X1200, ATI RS740, ATI RS740M, ATI RS740,
          ATI RS740M, ATI Radeon HD 2900 XT, ATI Radeon HD 2900 XT,
          ATI Radeon HD 2900 XT, ATI Radeon HD 2900 Pro, ATI Radeon HD 2900 GT,
          ATI FireGL V8650, ATI FireGL V8600, ATI FireGL V7600,
          ATI Radeon 4800 Series, ATI Radeon HD 4870 x2,
          ATI Radeon 4800 Series, ATI Radeon HD 4850 x2,
          ATI FirePro V8750 (FireGL), ATI FirePro V7760 (FireGL),
          ATI Mobility RADEON HD 4850, ATI Mobility RADEON HD 4850 X2,
          ATI Radeon 4800 Series, ATI FirePro RV770, AMD FireStream 9270,
          AMD FireStream 9250, ATI FirePro V8700 (FireGL),
          ATI Mobility RADEON HD 4870, ATI Mobility RADEON M98,
          ATI Mobility RADEON HD 4870, ATI Radeon 4800 Series,
          ATI Radeon 4800 Series, ATI FirePro M7750, ATI M98, ATI M98, ATI M98,
          ATI Mobility Radeon HD 4650, ATI Radeon RV730 (AGP),
          ATI Mobility Radeon HD 4670, ATI FirePro M5750,
          ATI Mobility Radeon HD 4670, ATI Radeon RV730 (AGP),
          ATI RV730XT [Radeon HD 4670], ATI RADEON E4600,
          ATI Radeon HD 4600 Series, ATI RV730 PRO [Radeon HD 4650],
          ATI FirePro V7750 (FireGL), ATI FirePro V5700 (FireGL),
          ATI FirePro V3750 (FireGL), ATI Mobility Radeon HD 4830,
          ATI Mobility Radeon HD 4850, ATI FirePro M7740, ATI RV740,
          ATI Radeon HD 4770, ATI Radeon HD 4700 Series, ATI Radeon HD 4770,
          ATI FirePro M5750, ATI RV610, ATI Radeon HD 2400 XT,
          ATI Radeon HD 2400 Pro, ATI Radeon HD 2400 PRO AGP, ATI FireGL V4000,
          ATI RV610, ATI Radeon HD 2350, ATI Mobility Radeon HD 2400 XT,
          ATI Mobility Radeon HD 2400, ATI RADEON E2400, ATI RV610,
          ATI FireMV 2260, ATI RV670, ATI Radeon HD3870,
          ATI Mobility Radeon HD 3850, ATI Radeon HD3850,
          ATI Mobility Radeon HD 3850 X2, ATI RV670,
          ATI Mobility Radeon HD 3870, ATI Mobility Radeon HD 3870 X2,
          ATI Radeon HD3870 X2, ATI FireGL V7700, ATI Radeon HD3850,
          ATI Radeon HD3690, AMD Firestream 9170, ATI Radeon HD 4550,
          ATI Radeon RV710, ATI Radeon RV710, ATI Radeon RV710,
          ATI Radeon HD 4350, ATI Mobility Radeon 4300 Series,
          ATI Mobility Radeon 4500 Series, ATI Mobility Radeon 4500 Series,
          ATI FirePro RG220, ATI Mobility Radeon 4330, ATI RV630,
          ATI Mobility Radeon HD 2600, ATI Mobility Radeon HD 2600 XT,
          ATI Radeon HD 2600 XT AGP, ATI Radeon HD 2600 Pro AGP,
          ATI Radeon HD 2600 XT, ATI Radeon HD 2600 Pro, ATI Gemini RV630,
          ATI Gemini Mobility Radeon HD 2600 XT, ATI FireGL V5600,
          ATI FireGL V3600, ATI Radeon HD 2600 LE,
          ATI Mobility FireGL Graphics Processor, ATI Radeon HD 3470,
          ATI Mobility Radeon HD 3430, ATI Mobility Radeon HD 3400 Series,
          ATI Radeon HD 3450, ATI Radeon HD 3450, ATI Radeon HD 3430,
          ATI Radeon HD 3450, ATI FirePro V3700, ATI FireMV 2450,
          ATI FireMV 2260, ATI FireMV 2260, ATI Radeon HD 3600 Series,
          ATI Radeon HD 3650 AGP, ATI Radeon HD 3600 PRO,
          ATI Radeon HD 3600 XT, ATI Radeon HD 3600 PRO,
          ATI Mobility Radeon HD 3650, ATI Mobility Radeon HD 3670,
          ATI Mobility FireGL V5700, ATI Mobility FireGL V5725,
          ATI Radeon HD 3200 Graphics, ATI Radeon 3100 Graphics,
          ATI Radeon HD 3200 Graphics, ATI Radeon 3100 Graphics,
          ATI Radeon HD 3300 Graphics, ATI Radeon HD 3200 Graphics,
          ATI Radeon 3000 Graphics, SUMO, SUMO, SUMO2, SUMO2, SUMO2, SUMO2,
          SUMO, SUMO, SUMO2, SUMO, SUMO, SUMO, SUMO, SUMO, ATI Radeon HD 4200,
          ATI Radeon 4100, ATI Mobility Radeon HD 4200,
          ATI Mobility Radeon 4100, ATI Radeon HD 4290, ATI Radeon HD 4250,
          AMD Radeon HD 6310 Graphics, AMD Radeon HD 6310 Graphics,
          AMD Radeon HD 6250 Graphics, AMD Radeon HD 6250 Graphics,
          AMD Radeon HD 6300 Series Graphics,
          AMD Radeon HD 6200 Series Graphics, PALM, PALM, PALM, CYPRESS,
          ATI FirePro (FireGL) Graphics Adapter,
          ATI FirePro (FireGL) Graphics Adapter,
          ATI FirePro (FireGL) Graphics Adapter, AMD Firestream 9370,
          AMD Firestream 9350, ATI Radeon HD 5800 Series,
          ATI Radeon HD 5800 Series, ATI Radeon HD 5800 Series,
          ATI Radeon HD 5800 Series, ATI Radeon HD 5900 Series,
          ATI Radeon HD 5900 Series, ATI Mobility Radeon HD 5800 Series,
          ATI Mobility Radeon HD 5800 Series,
          ATI FirePro (FireGL) Graphics Adapter,
          ATI FirePro (FireGL) Graphics Adapter,
          ATI Mobility Radeon HD 5800 Series, ATI Radeon HD 5700 Series,
          ATI Radeon HD 5700 Series, ATI Radeon HD 6700 Series,
          ATI Radeon HD 5700 Series, ATI Radeon HD 6700 Series,
          ATI Mobility Radeon HD 5000 Series,
          ATI Mobility Radeon HD 5000 Series, ATI Mobility Radeon HD 5570,
          ATI FirePro (FireGL) Graphics Adapter,
          ATI FirePro (FireGL) Graphics Adapter, ATI Radeon HD 5670,
          ATI Radeon HD 5570, ATI Radeon HD 5500 Series, REDWOOD,
          ATI Mobility Radeon HD 5000 Series,
          ATI Mobility Radeon HD 5000 Series, ATI Mobility Radeon Graphics,
          ATI Mobility Radeon Graphics, CEDAR,
          ATI FirePro (FireGL) Graphics Adapter,
          ATI FirePro (FireGL) Graphics Adapter, ATI FirePro 2270, CEDAR,
          ATI Radeon HD 5450, CEDAR, CEDAR, CAYMAN, CAYMAN, CAYMAN, CAYMAN,
          CAYMAN, CAYMAN, CAYMAN, CAYMAN, CAYMAN, CAYMAN,
          AMD Radeon HD 6900 Series, AMD Radeon HD 6900 Series, CAYMAN, CAYMAN,
          CAYMAN, AMD Radeon HD 6900M Series, Mobility Radeon HD 6000 Series,
          BARTS, BARTS, Mobility Radeon HD 6000 Series,
          Mobility Radeon HD 6000 Series, BARTS, BARTS, BARTS, BARTS,
          AMD Radeon HD 6800 Series, AMD Radeon HD 6800 Series,
          AMD Radeon HD 6700 Series, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS,
          TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS,
          TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS, TURKS,
          CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS,
          CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, CAICOS, ARUBA, ARUBA,
          ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA,
          ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA,
          ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, ARUBA,
          ARUBA, ARUBA, ARUBA, ARUBA, ARUBA, TAHITI, TAHITI, TAHITI, TAHITI,
          TAHITI, TAHITI, TAHITI, TAHITI, TAHITI, TAHITI, TAHITI, TAHITI,
          TAHITI, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN,
          PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN, PITCAIRN,
          VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE,
          VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE, VERDE,
          VERDE, VERDE, VERDE, VERDE, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND,
          OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND, OLAND,
          HAINAN, HAINAN, HAINAN, HAINAN, HAINAN, HAINAN, BONAIRE, BONAIRE,
          BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE,
          BONAIRE, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI,
          KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI,
          KABINI, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS,
          MULLINS, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS, MULLINS,
          MULLINS, MULLINS, MULLINS, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
          KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
          KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
          KAVERI, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII,
          HAWAII, HAWAII, HAWAII, HAWAII, HAWAII
  [ 69158.589] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
  [ 69158.589] (II) FBDEV: driver for framebuffer: fbdev
  [ 69158.589] (II) VESA: driver for VESA chipsets: vesa
  [ 69158.589] (II) [KMS] Kernel modesetting enabled.
  [ 69158.589] (WW) Falling back to old probe method for modesetting
  [ 69158.589] (WW) Falling back to old probe method for fbdev
  [ 69158.589] (II) Loading sub module "fbdevhw"
  [ 69158.589] (II) LoadModule: "fbdevhw"
  [ 69158.589] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
  [ 69158.589] (II) Module fbdevhw: vendor="X.Org Foundation"
  [ 69158.589]    compiled for 1.17.1, module version = 0.0.2
  [ 69158.589]    ABI class: X.Org Video Driver, version 19.0
  [ 69158.589] (WW) Falling back to old probe method for vesa
  [ 69158.589] (II) RADEON(0): Creating default Display subsection in Screen 
section
          "Default Screen Section" for depth/fbbpp 24/32
  [ 69158.589] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
  [ 69158.589] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp 
pixmaps)
  [ 69158.589] (==) RADEON(0): Default visual is TrueColor
  [ 69158.589] (==) RADEON(0): RGB weight 888
  [ 69158.589] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
  [ 69158.589] (--) RADEON(0): Chipset: "TAHITI" (ChipID = 0x679a)
  [ 69158.590] (EE) RADEON(0): [drm] failed to set drm interface version.
  [ 69158.590] (EE) RADEON(0): Kernel modesetting setup failed
  [ 69158.590] (II) UnloadModule: "radeon"
  [ 69158.590] (EE) Screen(s) found, but none have a usable configuration.
  [ 69158.590] (EE)
  Fatal server error:
  [ 69158.590] (EE) no screens found(EE)
  [ 69158.590] (EE)
  Please consult the The X.Org Foundation support
           at http://wiki.x.org
   for help.
  [ 69158.590] (EE) Please also check the log file at "/var/log/Xorg.1.log" for 
additional information.
  [ 69158.590] (EE)
  [ 69158.590] (EE) Server terminated with error (1). Closing log file.

  here is my lightdm.conf, only logind-check-graphical is enabled

  ➜  ~  cat /etc/lightdm/lightdm.conf
  #
  # General configuration
  #
  # start-default-seat = True to always start one seat if none are defined in 
the configuration
  # greeter-user = User to run greeter as
  # minimum-display-number = Minimum display number to use for X servers
  # minimum-vt = First VT to run displays on
  # lock-memory = True to prevent memory from being paged to disk
  # user-authority-in-system-dir = True if session authority should be in the 
system location
  # guest-account-script = Script to be run to setup guest account
  # logind-check-graphical = True to on start seats that are marked as 
graphical by logind
  # log-directory = Directory to log information to
  # run-directory = Directory to put running state in
  # cache-directory = Directory to cache to
  # sessions-directory = Directory to find sessions
  # remote-sessions-directory = Directory to find remote sessions
  # greeters-directory = Directory to find greeters
  #
  [LightDM]
  #start-default-seat=true
  #greeter-user=lightdm
  #minimum-display-number=0
  #minimum-vt=7
  #lock-memory=true
  #user-authority-in-system-dir=false
  #guest-account-script=guest-account
  logind-check-graphical=true
  #log-directory=/var/log/lightdm
  #run-directory=/var/run/lightdm
  #cache-directory=/var/cache/lightdm
  #sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions
  #remote-sessions-directory=/usr/share/lightdm/remote-sessions
  #greeters-directory=/usr/share/lightdm/greeters:/usr/share/xgreeters

  #
  # Seat defaults
  #
  # type = Seat type (xlocal, xremote)
  # pam-service = PAM service to use for login
  # pam-autologin-service = PAM service to use for autologin
  # pam-greeter-service = PAM service to use for greeters
  # xserver-command = X server command to run (can also contain arguments e.g. 
X -special-option)
  # xserver-layout = Layout to pass to X server
  # xserver-config = Config file to pass to X server
  # xserver-allow-tcp = True if TCP/IP connections are allowed to this X server
  # xserver-share = True if the X server is shared for both greeter and session
  # xserver-hostname = Hostname of X server (only for type=xremote)
  # xserver-display-number = Display number of X server (only for type=xremote)
  # xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
  # xdmcp-port = XDMCP UDP/IP port to communicate on
  # xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in 
keys.conf)
  # unity-compositor-command = Unity compositor command to run (can also 
contain arguments e.g. unity-system-compositor -special-option)
  # unity-compositor-timeout = Number of seconds to wait for compositor to start
  # greeter-session = Session to load for greeter
  # greeter-hide-users = True to hide the user list
  # greeter-allow-guest = True if the greeter should show a guest login option
  # greeter-show-manual-login = True if the greeter should offer a manual login 
option
  # greeter-show-remote-login = True if the greeter should offer a remote login 
option
  # user-session = Session to load for users
  # allow-user-switching = True if allowed to switch users
  # allow-guest = True if guest login is allowed
  # guest-session = Session to load for guests (overrides user-session)
  # session-wrapper = Wrapper script to run session with
  # greeter-wrapper = Wrapper script to run greeter with
  # guest-wrapper = Wrapper script to run guest sessions with
  # display-setup-script = Script to run when starting a greeter session (runs 
as root)
  # display-stopped-script = Script to run after stopping the display server 
(runs as root)
  # greeter-setup-script = Script to run when starting a greeter (runs as root)
  # session-setup-script = Script to run when starting a user session (runs as 
root)
  # session-cleanup-script = Script to run when quitting a user session (runs 
as root)
  # autologin-guest = True to log in as guest by default
  # autologin-user = User to log in with by default (overrides autologin-guest)
  # autologin-user-timeout = Number of seconds to wait before loading default 
user
  # autologin-session = Session to load for automatic login (overrides 
user-session)
  # autologin-in-background = True if autologin session should not be 
immediately activated
  # exit-on-failure = True if the daemon should exit if this seat fails
  #
  [SeatDefaults]
  #type=xlocal
  #pam-service=lightdm
  #pam-autologin-service=lightdm-autologin
  #pam-greeter-service=lightdm-greeter
  #xserver-command=X
  #xserver-layout=
  #xserver-config=
  #xserver-allow-tcp=false
  #xserver-share=true
  #xserver-hostname=
  #xserver-display-number=
  #xdmcp-manager=
  #xdmcp-port=177
  #xdmcp-key=
  #unity-compositor-command=unity-system-compositor
  #unity-compositor-timeout=60
  #greeter-session=example-gtk-gnome
  #greeter-hide-users=false
  #greeter-allow-guest=true
  #greeter-show-manual-login=false
  #greeter-show-remote-login=true
  #user-session=default
  #allow-user-switching=true
  #allow-guest=true
  #guest-session=
  #session-wrapper=lightdm-session
  #greeter-wrapper=
  #guest-wrapper=
  #display-setup-script=
  #display-stopped-script=
  #greeter-setup-script=
  #session-setup-script=
  #session-cleanup-script=
  #autologin-guest=false
  #autologin-user=
  #autologin-user-timeout=0
  #autologin-in-background=false
  #autologin-session=UNIMPLEMENTED
  #exit-on-failure=false

  #
  # Seat configuration
  #
  # Each seat must start with "Seat:".
  # Uses settings from [SeatDefaults], any of these can be overriden by setting 
them in this section.
  #
  #[Seat:0]

  #
  # XDMCP Server configuration
  #
  # enabled = True if XDMCP connections should be allowed
  # port = UDP/IP port to listen for connections on
  # key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not 
use authentication (stored in keys.conf)
  #
  # The authentication key is a 56 bit DES key specified in hex as 
0xnnnnnnnnnnnnnn.  Alternatively
  # it can be a word and the first 7 characters are used as the key.
  #
  [XDMCPServer]
  #enabled=false
  #port=177
  #key=

  #
  # VNC Server configuration
  #
  # enabled = True if VNC connections should be allowed
  # command = Command to run Xvnc server with
  # port = TCP/IP port to listen for connections on
  # width = Width of display to use
  # height = Height of display to use
  # depth = Color depth of display to use
  #
  [VNCServer]
  #enabled=false
  #command=Xvnc
  #port=5900
  #width=1024
  #height=768
  #depth=8

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