Bug 93554

As reported in (https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1522727).

Since upgrading to Ubuntu 15.10, X.org crashes intermittently. The screen will suddenly turn black, and after a few seconds, the LightDM login screen appears. All unsaved work is lost of course.

A clean install of 15.10 did not help, the problem persists.

It happens absolutely randomly. I haven't been able to figure out any pattern related to time or specific user interaction that would cause this, except that I believe the crash is always triggered by some kind of input device action, i.e. mouse click or key press. The system won't crash if I don't actively do any work.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xserver-xorg-core 2:1.17.2-1ubuntu9.1
ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
Uname: Linux 4.2.0-19-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
BootLog:
 Scanning for Btrfs filesystems
 fsck from util-linux 2.26.2
 /dev/sda1: clean, 365974/2501856 files, 2841542/9999755 blocks
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Fri Dec  4 08:50:28 2015
DistUpgraded: Fresh install
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus:
 acpi-call, 1.1.0, 4.2.0-18-generic, x86_64: installed
 acpi-call, 1.1.0, 4.2.0-19-generic, x86_64: installed
 vboxhost, 5.0.8, 4.2.0-18-generic, x86_64: installed
 vboxhost, 5.0.8, 4.2.0-19-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21fb]
InstallationDate: Installed on 2015-10-25 (39 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: LENOVO 2356AB2
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic root=UUID=794b7585-5080-4bd4-a642-688538787fea ro quiet splash vt.handoff=7
SourcePackage: xorg-server
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/12/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G7ET63WW (2.05 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2356AB2
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG7ET63WW(2.05):bd11/12/2012:svnLENOVO:pn2356AB2:pvrThinkPadT430s:rvnLENOVO:rn2356AB2:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2356AB2
dmi.product.version: ThinkPad T430s
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Fri Dec  4 08:49:37 2015
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                8510
 vendor                                     AUO
xserver.version: 2:1.17.2-1ubuntu9.1