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I am using ubuntu 14.04 64-bit. (All my packages were up-to-date as of
about 1 week ago.) My hardware is an Acer C720 (Intel graphics). The
symptoms of the problem is the display completely stops updating, except
the mouse cursor continues to move. Clicking and any keypresses have no
effect. The system remains in this state for about 15-60 seconds, then
it recovers and goes back to normal.

The problem most commonly happens when using chrome or chromium to do
any kind of intesive hardware-accelerated rendering. Typically a youtube
video or and HTML5 game with lots of animations. The problem tends to
happen during periods of high CPU usage.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
Uname: Linux 3.13.0-16-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue Mar 18 18:33:56 2014
DistUpgraded: 2014-03-08 16:40:06,427 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a06] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0a11]
Lsusb:
 Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 002 Device 007: ID 0489:e056 Foxconn / Hon Hai 
 Bus 002 Device 002: ID 1bcf:2c67 Sunplus Innovation Technology Inc. 
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Peppy
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-16-generic root=UUID=cffcb17a-ea52-4a0f-8e04-373de2625201 ro quiet splash add_efi_memmap boot=local noresume noswap i915.modeset=1 tpm_tis.force=1 tpm_tis.interrupts=0 nmi_watchdog=panic,lapic vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to trusty on 2014-03-08 (10 days ago)
dmi.bios.date: 10/29/2013
dmi.bios.vendor: coreboot
dmi.chassis.type: 3
dmi.chassis.vendor: Acer
dmi.modalias: dmi:bvncoreboot:bvr:bd10/29/2013:svnAcer:pnPeppy:pvr1.0:cvnAcer:ct3:cvr:
dmi.product.name: Peppy
dmi.product.version: 1.0
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.11+14.04.20140310-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Tue Mar 18 14:49:55 2014
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                4402 
 vendor                                     CMN
xserver.version: 2:1.15.0-1ubuntu7

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


** Tags: amd64 apport-bug compiz-0.9 false-gpu-hang freeze trusty ubuntu
-- 
8086:0a06 [Acer C720] Screen freeze during use of chrome/chromium
https://bugs.launchpad.net/bugs/1294391
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