I have this problem on Linux Mint 17.1 (Ubuntu 14.04 base) too on a Lenovo T420s with Optimus graphics using the Nvidia card as primary.
It seems to work as expected if I put the screens in order [LVDS-1-0] -- [VGA-1-0] -- [DP-3] from left to right, but if I put DP-3 in the middle, I can't disable panning for it. Just putting the screens in this physical order works for me, but I run into another problem when I try to set the middle screen (VGA-1-0) to primary in order to get my KDE taskbar on the middle screen. Trying to set any of the screens provided by modesetting to primary fails with the following error: $ xrandr --output VGA-1-0 --primary X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 30 (RRSetOutputPrimary) Serial number of failed request: 50 Current serial number in output stream: 52 $ xrandr --output LVDS-1-0 --primary X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 30 (RRSetOutputPrimary) Serial number of failed request: 50 Current serial number in output stream: 52 I attach my Xorg configuration (generated by nvidia-settings), the Xorg log file, a dump of 'xrandr --verbose' output and 'xrandr --listproviders' output. ** Attachment added: "nvidia_multiscreen_problem.tar.gz" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1326688/+attachment/4762455/+files/nvidia_multiscreen_problem.tar.gz -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1326688 Title: Can't disable panning on multiple monitors Status in xorg-server package in Ubuntu: Confirmed Bug description: System: Dell laptop E6520 with two graphic cards: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller]) 01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [NVS 4200M] (rev a1) (prog-if 00 [VGA controller]) I have 3 monitors connected through docking stations, DP-0 and DP-1 connected to Nvidia card and VGA-1-0 connected to Intel card. I'm usind nvida-331 driver and nvidia-prime: nbr@nbr-nb:~$ dpkg --get-selections | grep nvidia nvidia-331 install nvidia-common install nvidia-libopencl1-331 install nvidia-opencl-icd-331 install nvidia-prime install nvidia-settings install I can setup correctly this triple-head config with Monitor Settings in Ubuntu Control Panel, but this enable panning as per xrandr output: nbr@nbr-nb:~$ xrandr -q | grep conn VGA-0 disconnected (normal left inverted right x axis y axis) LVDS-0 disconnected (normal left inverted right x axis y axis) DP-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm panning 2560x1024+0+0 tracking 4240x1050+0+0 border 0/0/0/0 DP-1 connected primary 1680x1050+1280+0 (normal left inverted right x axis y axis) 433mm x 270mm panning 2960x1050+1280+0 tracking 4240x1050+0+0 border 0/0/0/0 HDMI-0 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) DP-3 disconnected (normal left inverted right x axis y axis) LVDS-1-0 connected VGA-1-0 connected 1280x1024+2960+0 376mm x 301mm and it seems there is no way to disable it (even issuing xrandr with --panning 0x0+0+0 option to DP-0 and DP-1 has no effect). This was working correctly after a undock/dock of the laptop, maybe an update broke config since it has always showed problems with undock/dock, but a reboot always cured the situation. Now it can't be setup like initial config anymore (three indipendent monitors with no panning and windows moving around all monitors). other sysinfo: nbr@nbr-nb:~$ lsb_release -rd Description: Ubuntu 14.04 LTS Release: 14.04 nbr@nbr-nb:~$ apt-cache policy nvidia-331 nvidia-331: Installato: 331.38-0ubuntu7 nbr@nbr-nb:~$ apt-cache policy nvidia-prime nvidia-prime: Installato: 0.6.2 nbr@nbr-nb:~$ apt-cache policy xserver-xorg xserver-xorg: Installato: 1:7.7+1ubuntu8 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1326688/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
