Public bug reported:

I get a blank screen with only mouse pointer upon boot, after the splash. This 
started after the mesa driver update on 2/15/18.  The display does not appear 
to switch to tty7 upon lightdm start. 
 Xorg.0.log quickly grows and continues to grow.

I believe `lightdm` is not starting `Xorg` on the correct display, but,
I don't know how to determine this from the logs.

Here is the command line `lightdm` uses to launch `Xorg`:

    ~$ ps -ef | grep lightdm
    root      1261     1  0 18:23 ?        00:00:00 /usr/sbin/lightdm
    root      1316  1261  6 18:23 tty7     00:00:03 /usr/lib/xorg/Xorg -core :0 
-seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
    root      1350  1261  0 18:23 ?        00:00:00 lightdm --session-child 12 

*OCCURRENCE ON 2/15/18:*

I performed a normal upgrade on 2/15/18 through the software manager in

It upgraded the following libraries (`/var/log/dpkg.log [pkg][old
ver][new ver]`):

    libegl1-mesa-dev:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libwayland-egl1-mesa:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-ubuntu0~16.04.1
    libwayland-egl1-mesa:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libegl1-mesa:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libegl1-mesa:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libgbm1:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libgbm1:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libosmesa6:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libosmesa6:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libgles2-mesa:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libgl1-mesa-glx:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libgl1-mesa-glx:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libglapi-mesa:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libglapi-mesa:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libgl1-mesa-dri:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libgl1-mesa-dri:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    libxatracker2:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    linux-firmware:all 1.157.15 1.157.16
    mesa-vdpau-drivers:i386 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    mesa-vdpau-drivers:amd64 17.2.4-0ubuntu1~16.04.4 17.2.8-0ubuntu0~16.04.1
    xserver-xorg-video-radeon-hwe-16.04:amd64 1:7.9.0-0ubuntu1~16.04.1 
    xserver-xorg-video-ati-hwe-16.04:amd64 1:7.9.0-0ubuntu1~16.04.1 

I should note, this is *not* the compiz/unity update package list.  It
is the mesa drivers.

Upon reboot, I started getting a blank screen with only a mouse pointer
when the display manager started.

I press <kbd>CTRL</kbd>+<kbd>ALT</kbd>+<kbd>F1</kbd> to go into console,
and I can find the following in the `Xorg.0.log`:

    [  4800.851] (WW) RADEON(0): flip queue failed: Invalid argument
    [  4800.851] (WW) RADEON(0): Page flip failed: Invalid argument

These warning messages are *constantly* streaming into the log file, and
it *keeps growing*.  This wasn't present before the library update.  I
will be happy to provide a logfile upon request.

Video h/w on my laptop:

       description: VGA compatible controller
       product: RV516/M64-S [Mobility Radeon X2300]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:16 memory:d0000000-d3ffffff ioport:4000(size=256) 
memory:d8300000-d830ffff memory:c0000-dffff

1st lines of modinfo output:

    license:        GPL and additional rights
    description:    ATI Radeon

*UPDATE 2/16/18:*

I appear to be booting to the wrong VT display.  All of the symptoms
above are true; however, if I perform a
<kbd>CTRL</kbd>+<kbd>ALT</kbd>+<kbd>F1</kbd> (up to <kbd>F6</kbd>) at
startup and then immediately perform a
<kbd>CTRL</kbd>+<kbd>ALT</kbd>+<kbd>F7</kbd>, which switches the VT, I
go to my normal desktop as if it had booted correctly.
<kbd>CTRL</kbd>+<kbd>ALT</kbd>+<kbd>F7</kbd> without first going to
console does not do anything.  So, this simplifies things somewhat as it
now looks to be a config issue.  Lightdm seems to start Xorg on the
wrong display.  I tried a vt.handoff=7 on the linux kernel command line,
and this did not help.

Here is the output of `w` immediately after pressing
<kbd>CTRL</kbd>+<kbd>ALT</kbd>+<kbd>F7</kbd> and going to the normal

     09:38:01 up 44 min,  1 user,  load average: 0.60, 0.67, 0.82
    USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
    user1    tty7     :0               08:53   44:14   6:16   0.29s 
/sbin/upstart -

This display listing appears normal.

I should note that compiz and unity still seem to function.  The desktop
is fully available and already loaded when I switch to tty7.

*UPDATE 2/19/18:*

I don't believe this to be a duplicate of the compiz/unity issue.  The
issue I observed resulted from the mesa driver update on the morning of
2/15/18.  The compiz/unity update has yet to be applied to my system.
In fact, there is one other post that looks to be the same issue as I am
seeing, it is:

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-video-radeon-hwe-16.04 1:7.10.0-1~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-26.29~16.04.2-generic 4.13.13
Uname: Linux 4.13.0-26-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Feb 19 10:22:52 2018
InstallationDate: Installed on 2017-04-05 (319 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
 PATH=(custom, no user)
SourcePackage: xserver-xorg-video-ati-hwe-16.04
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xserver-xorg-video-ati-hwe-16.04 (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug xenial

** Attachment added: "Xorg.0.log"

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  Blank screen with only mouse pointer after mesa driver update; display
  does not switch to tty7 upon lightdm start; Xorg.0.log quickly grows

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