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[Rohan Dhruva <rohandhruva@xxxxxxxxx>]

I have switched to UXA for now, and that seems to have solved all the
problems: I don't see any display glitches, and no lock-ups. The "stuck
on render ring" messages are also gone.

Let me know if I can provide any more debugging information.

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https://bugs.launchpad.net/bugs/1282867

Title:
  Many bugs in rendering with lockups, likely caused by SNA

Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After the latest kernel upgrade, my system has many graphical
  glitches, and is locking up frequently. The dmesg output has errors
  like these:

  [ 1951.568672] Watchdog[2753]: segfault at 0 ip 00007fe00773a32e sp 00007fdff869f680 error 6 in chrome[7fe003cbe000+5dd9000]
  [ 1959.241676] [drm] stuck on render ring
  [ 1959.241685] [drm] GPU crash dump saved to /sys/class/drm/card0/error
  [ 1959.241686] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
  [ 1959.241687] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
  [ 1959.241688] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
  [ 1959.241689] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
  [ 1959.244266] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x3dc32000 ctx 17) at 0x3dc32c48
  [ 3964.330034] perf samples too long (2503 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
  [ 4849.028446] [drm] stuck on render ring
  [ 4849.028492] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x565c2000 ctx 17) at 0x565c2c48
  [ 4861.093551] Watchdog[5226]: segfault at 0 ip 00007fc00d36f32e sp 00007fbffe2d4680 error 6 in chrome[7fc0098f3000+5dd9000]
  [ 4863.020198] [drm] stuck on render ring
  [ 4863.020255] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x3dc32000 ctx 17) at 0x3dc32c48
  [ 4893.028245] [drm] stuck on render ring
  [ 4893.028295] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x4cbed000 ctx 10) at 0x4cbedc98
  [ 4899.041855] [drm] stuck on render ring
  [ 4899.041900] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0xea3d000 ctx 10) at 0xea3dc98
  [ 4899.041903] [drm:i915_context_is_banned] *ERROR* context hanging too fast, declaring banned!
  [ 5833.173837] warning: `VBoxHeadless' uses 32-bit capabilities (legacy support in use)
  [ 5833.326542] device vboxnet0 entered promiscuous mode
  [ 6429.476175] [drm] stuck on render ring
  [ 6488.455986] [drm] stuck on render ring
  [ 6547.507818] [drm] stuck on render ring
  [ 6615.490047] [drm] stuck on render ring

  I am not sure if the xserver-xorg-video-intel ricver was also updated
  at the same time. This is the version in use:

  rdhruva@ubuntu:~$ apt-cache policy xserver-xorg-video-intel
  xserver-xorg-video-intel:
    Installed: 2:2.99.910-0ubuntu1
    Candidate: 2:2.99.910-0ubuntu1
    Version table:
   *** 2:2.99.910-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-11-generic 3.13.0-11.31
  ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
  Uname: Linux 3.13.0-11-generic x86_64
  ApportVersion: 2.13.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  rdhruva    2154 F.... pulseaudio
   /dev/snd/pcmC0D0p:   rdhruva    2154 F...m pulseaudio
  CurrentDesktop: KDE
  Date: Thu Feb 20 19:29:20 2014
  HibernationDevice: RESUME=UUID=33c83ff3-ead7-4122-a1f0-9602e848cb80
  InstallationDate: Installed on 2014-01-24 (27 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140121.1)
  MachineType: LENOVO 2356EF2
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-11-generic root=UUID=9a425350-3b9f-45f7-9587-97f5e539c7e6 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-11-generic N/A
   linux-backports-modules-3.13.0-11-generic  N/A
   linux-firmware                             1.125
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/16/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G7ET98WW (2.58 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2356EF2
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: 2045260
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG7ET98WW(2.58):bd12/16/2013:svnLENOVO:pn2356EF2:pvrThinkPadT430s:rvnLENOVO:rn2356EF2:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2356EF2
  dmi.product.version: ThinkPad T430s
  dmi.sys.vendor: LENOVO

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