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[Bug 1556965] [NEW] Xorg freeze


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Symptoms are: screen/console/keyboard non-funtional. Xorg has crashed.
System is up, ssh login is possible. Unable to restart display manager,
unable to reboot, must powercycle machine to recover.

Seems to be related to screensaver/locker (light-locker). Observing
problem after being away from keyboard for some time.

$ lsb_release -d
Description:	Ubuntu Xenial Xerus (development branch)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4
Uname: Linux 4.4.0-11-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: XFCE
Date: Mon Mar 14 15:01:49 2016
DistUpgraded: 2015-12-01 13:45:07,953 DEBUG failed to SystemUnLock() (E:Not locked)
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GpuHangFrequency: Several times a day
GpuHangReproducibility: Occurs more often under certain circumstances
GpuHangStarted: Within the last week or two
 Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [103c:18e5]
 ** (lightdm-gtk-greeter:2891): WARNING **: Failed to load user image: Failed to open file '/home/vegardv/.face': No such file or directory
 init: indicator-power main process (2937) killed by TERM signal
 init: indicator-application main process (2940) killed by TERM signal
MachineType: Hewlett-Packard HP EliteDesk 800 G1 USDT
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-11-generic root=/dev/mapper/voll2--vg-root ro splash quiet vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to xenial on 2015-12-01 (104 days ago)
dmi.bios.date: 12/17/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L01 v02.21
dmi.board.asset.tag: CZC41911VB
dmi.board.name: 18E5
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC41911VB
dmi.chassis.type: 3
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrL01v02.21:bd12/17/2013:svnHewlett-Packard:pnHPEliteDesk800G1USDT:pvr:rvnHewlett-Packard:rn18E5:rvr:cvnHewlett-Packard:ct3:cvr:
dmi.product.name: HP EliteDesk 800 G1 USDT
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.1-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon Mar 14 14:56:12 2016
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
 product id                                2095 
 vendor                                     SAM
xserver.version: 2:1.18.1-1ubuntu3

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

** Tags: amd64 apport-bug freeze ubuntu xenial
Xorg freeze
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