(In reply to comment #18)
> Created attachment 93534 [details]
> crash dump when using patch from comment #13
> 
> Tried patch from comment #13 . Apparently it didn't solved the issue,

That's actually reassuring. The crash dump shows that the patch is
working and the GPU is awake, so forcewake is definitely not an issue
here.

> but
> there is some notable change: usually I was able to spot the hang because
> everything freeze, only the mouse moves. Eventually and often, for some very
> weird reason, firefox fonts are corrupted, some latin letter is replaced
> with non latin one or anyway some other symbol, the only fix is to restart
> firefox. This time just the latter happened. Luckly I checked dmesg and I
> saw the "stuck at render ring" notification.

That just sounds like the usual dangers with a hung gpu and discarding
work before resetting. (We have plans to fix it.)

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1274779

Title:
  [ivb] hang on pageflip (IPEHR: 0x0a000001)

Status in X.org xf86-video-intel:
  Confirmed
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Confirmed

Bug description:
  False GPU lockup  IPEHR: 0x0a000001

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-intel 2:2.99.907-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  Uname: Linux 3.13.0-5-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Wed Jan 29 23:32:19 2014
  DistUpgraded: 2013-12-25 22:45:46,524 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DuplicateSignature: GPU lockup  IPEHR: 0x0a000001 Ubuntu 14.04
  ExecutablePath: /usr/share/apport/apport-gpu-error-intel.py
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21f4]
   NVIDIA Corporation GF108M [NVS 5400M] [10de:0def] (rev a1) (prog-if 00 [VGA 
controller])
     Subsystem: Lenovo Device [17aa:21f4]
  InstallationDate: Installed on 2013-05-30 (245 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  InterpreterPath: /usr/bin/python3.3
  MachineType: LENOVO 2342CTO
  ProcCmdline: /usr/bin/python3 /usr/share/apport/apport-gpu-error-intel.py
  ProcEnviron:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-5-generic 
root=UUID=db82f5ed-cf1b-4bea-bcd8-8ec4fb76a850 ro acpi_backlight=vendor 
acpi_osi=Linux quiet splash i915.i915_enable_rc6=1 pcie_aspm=force vt.handoff=7
  RelatedPackageVersions:
   xserver-xorg             1:7.7+1ubuntu7
   libdrm2                  2.4.52-1
   xserver-xorg-video-intel 2:2.99.907-0ubuntu1
  SourcePackage: xserver-xorg-video-intel
  Title: False GPU lockup  IPEHR: 0x0a000001
  UpgradeStatus: Upgraded to trusty on 2013-12-26 (35 days ago)
  UserGroups:
   
  dmi.bios.date: 10/19/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G1ET73WW (2.09 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2342CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 STD DPK TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG1ET73WW(2.09):bd10/19/2012:svnLENOVO:pn2342CTO:pvrThinkPadT430:rvnLENOVO:rn2342CTO:rvrWin8STDDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2342CTO
  dmi.product.version: ThinkPad T430
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.907-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu1
  xserver.bootTime: Thu Jan 30 20:19:46 2014
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                8510 
   vendor                                     AUO
  xserver.version: 2:1.14.5-1ubuntu2

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