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[Tito <tito@xxxxxxxxxx>]

I can confirm this very annoying bug with i915 driver (on Lenovo x220).

It creates all sorts of graphical difficulties in Chromium (no vsync, no
interpolation of fullscreen videos, and of course no WebGL)

 LIBGL_DRI3_DISABLE=1 is a good fix.

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https://bugs.launchpad.net/bugs/1371834

Title:
  Chrome causes segfault in i965_dri.so

Status in Chromium Browser:
  Unknown
Status in “mesa” package in Ubuntu:
  Confirmed
Status in Debian GNU/Linux:
  New

Bug description:
  Running chrome 38.0.2125.66-1 on Ubuntu 14.10, on Lenovo X230

  When I start a new instance of chrome, it cannot enable WebGL. I have
  reported that bug separately to chrome at
  https://code.google.com/p/chromium/issues/detail?id=416207

  I suspect the cause of the bug is in mesa, as dmesg contains evidence
  of a segfault:

  [31979.398090] chrome[24013]: segfault at 20 ip 00007fbbd5ca5d83 sp 00007fffd7669ab0 error 4 in i965_dri.so[7fbbd59c4000+50a000]
  [31979.585606] chrome[24104]: segfault at 20 ip 00007f7550c26d83 sp 00007fff970b4630 error 4 in i965_dri.so[7f7550945000+50a000]
  [31979.737378] chrome[24117]: segfault at 20 ip 00007ffd06e45d83 sp 00007fffc989f440 error 4 in i965_dri.so[7ffd06b64000+50a000]

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: libgl1-mesa-dri 10.2.6-1ubuntu3
  ProcVersionSignature: Ubuntu 3.16.0-16.22-generic 3.16.2
  Uname: Linux 3.16.0-16-generic x86_64
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sat Sep 20 11:17:41 2014
  DistUpgraded: 2014-09-02 14:59:08,481 DEBUG failed to SystemUnLock() (E:Not locked)
  DistroCodename: utopic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21fa]
  MachineType: LENOVO 23301B9
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-16-generic root=/dev/mapper/hostname--vg-root ro splash quiet crashkernel=384M-:128M crashkernel=384M-:128M nomdmonddf nomdmonisw crashkernel=384M-:128M vt.handoff=7
  SourcePackage: mesa
  UpgradeStatus: Upgraded to utopic on 2014-09-02 (17 days ago)
  dmi.bios.date: 07/09/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET95WW (2.55 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 23301B9
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 Pro
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ET95WW(2.55):bd07/09/2013:svnLENOVO:pn23301B9:pvrThinkPadX230:rvnLENOVO:rn23301B9:rvr0B98401Pro:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 23301B9
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.2.6-1ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.2.6-1ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Fri Sep 19 15:45:16 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4204 
   vendor                                     AUO
  xserver.version: 2:1.16.0-1ubuntu1

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