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[Dan Doel <dan.doel@xxxxxxxxx>]

I have, I think, a reliable way to trigger this behavior, if that helps.
It requires a non-trivial setup, though.

I have gnome-shell running on dual monitors. The first is 1920x1200, the
second is 1920x1080 (not sure if the resolution difference matters). If
I run a full-screen game on The 1920x1200 monitor, I get freezes, and
notes in the dmesg about hangcheck timers and kickrings ("stuck wait on
blitter ring").

I believe OpenGL acceleration of the desktop is important, because the
freezes are not triggered in fluxbox, for instance. I'm not sure if the
game itself needs to be using OpenGL, or if the full-screen window is
the triggering factor, or something else entirely. It is important that
the game keep the monitors distinct, and only go full screen on one. I
just tried it on Battle for Wesnoth, and full screen there sets the
monitors to mirror, which doesn't trigger the problem.

This is on an i7 4770, if that matters.

I realize this is may be difficult to put together for a test setup, but
I thought I'd mention it.

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https://bugs.launchpad.net/bugs/1140716

Title:
  [regression] 3.5.0-26-generic and  3.2.0-39-generic GPU hangs on
  Sandybridge

Status in Direct Rendering Infrastructure:
  Confirmed
Status in The Linux Kernel:
  Invalid
Status in “linux” package in Ubuntu:
  Invalid
Status in “linux-lts-quantal” package in Ubuntu:
  Invalid
Status in “linux” source package in Precise:
  Fix Released
Status in “linux-lts-quantal” source package in Precise:
  Fix Released
Status in “linux” source package in Quantal:
  Fix Released
Status in “linux-lts-quantal” source package in Quantal:
  Invalid
Status in “linux” source package in Raring:
  Confirmed
Status in “linux-lts-quantal” source package in Raring:
  Invalid
Status in “linux” package in Debian:
  New
Status in “linux” package in Fedora:
  Unknown

Bug description:
  I'm getting errors about GPU hangs every minute or so (usually only
  when using FF and scrolling a webpage or something). I also get an
  annoying ubuntu dialog saying there is a "system error".

  This didn't happen with 3.5.0-24-generic.

  Here is the dmesg:
  [15169.033709] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [15169.034517] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [15628.480216] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [15628.480570] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [15844.231372] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [15844.231773] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [20173.232593] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [20173.233211] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [26285.650393] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [26285.650980] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [26285.658405] ------------[ cut here ]------------
  [26285.658472] WARNING: at /build/buildd/linux-3.5.0/drivers/gpu/drm/i915/intel_pm.c:2505 gen6_enable_rps+0x706/0x710 [i915]()
  [26285.658474] Hardware name: SATELLITE Z830
  [26285.658476] Modules linked in: sdhci_pci sdhci btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs reiserfs ext2 snd_hda_codec_hdmi snd_hda_codec_realtek joydev btusb coretemp kvm_intel kvm arc4 ghash_clmulni_intel aesni_intel cryptd aes_x86_64 snd_hda_intel snd_hda_codec snd_hwdep uvcvideo snd_pcm videobuf2_core microcode videodev bnep iwlwifi videobuf2_vmalloc snd_seq_midi psmouse videobuf2_memops snd_rawmidi rfcomm pcspkr snd_seq_midi_event serio_raw snd_seq bluetooth mac80211 snd_timer snd_seq_device i915 drm_kms_helper cfg80211 drm toshiba_acpi snd sparse_keymap soundcore wmi i2c_algo_bit toshiba_bluetooth snd_page_alloc parport_pc mei video mac_hid lpc_ich ppdev nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc lp parport e1000e ahci libahci [last unloaded: sdhci]
  [26285.658537] Pid: 23433, comm: kworker/u:0 Not tainted 3.5.0-26-generic #40-Ubuntu
  [26285.658539] Call Trace:
  [26285.658549]  [<ffffffff81051bef>] warn_slowpath_common+0x7f/0xc0
  [26285.658553]  [<ffffffff81051c4a>] warn_slowpath_null+0x1a/0x20
  [26285.658569]  [<ffffffffa02d32e6>] gen6_enable_rps+0x706/0x710 [i915]
  [26285.658584]  [<ffffffffa02bf3f6>] intel_modeset_init_hw+0x66/0xa0 [i915]
  [26285.658595]  [<ffffffffa02954b4>] i915_reset+0x1a4/0x6e0 [i915]
  [26285.658601]  [<ffffffff8101257b>] ? __switch_to+0x12b/0x420
  [26285.658612]  [<ffffffffa029a943>] i915_error_work_func+0xc3/0x110 [i915]
  [26285.658618]  [<ffffffff8107097a>] process_one_work+0x12a/0x420
  [26285.658629]  [<ffffffffa029a880>] ? gen6_pm_rps_work+0xe0/0xe0 [i915]
  [26285.658632]  [<ffffffff8107152e>] worker_thread+0x12e/0x2f0
  [26285.658636]  [<ffffffff81071400>] ? manage_workers.isra.26+0x200/0x200
  [26285.658640]  [<ffffffff81076023>] kthread+0x93/0xa0
  [26285.658644]  [<ffffffff8168a3e4>] kernel_thread_helper+0x4/0x10
  [26285.658649]  [<ffffffff81075f90>] ? kthread_freezable_should_stop+0x70/0x70
  [26285.658652]  [<ffffffff8168a3e0>] ? gs_change+0x13/0x13
  [26285.658654] ---[ end trace 59c6162fdfcbffee ]---
  [26756.021167] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [26756.021426] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [26766.014093] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [26766.014397] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [26932.376233] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [26932.376544] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [26932.384285] ------------[ cut here ]------------
  [26932.384354] WARNING: at /build/buildd/linux-3.5.0/drivers/gpu/drm/i915/intel_pm.c:2505 gen6_enable_rps+0x706/0x710 [i915]()
  [26932.384356] Hardware name: SATELLITE Z830
  [26932.384358] Modules linked in: sdhci_pci sdhci btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs reiserfs ext2 snd_hda_codec_hdmi snd_hda_codec_realtek joydev btusb coretemp kvm_intel kvm arc4 ghash_clmulni_intel aesni_intel cryptd aes_x86_64 snd_hda_intel snd_hda_codec snd_hwdep uvcvideo snd_pcm videobuf2_core microcode videodev bnep iwlwifi videobuf2_vmalloc snd_seq_midi psmouse videobuf2_memops snd_rawmidi rfcomm pcspkr snd_seq_midi_event serio_raw snd_seq bluetooth mac80211 snd_timer snd_seq_device i915 drm_kms_helper cfg80211 drm toshiba_acpi snd sparse_keymap soundcore wmi i2c_algo_bit toshiba_bluetooth snd_page_alloc parport_pc mei video mac_hid lpc_ich ppdev nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc lp parport e1000e ahci libahci [last unloaded: sdhci]
  [26932.384421] Pid: 24262, comm: kworker/u:2 Tainted: G        W    3.5.0-26-generic #40-Ubuntu
  [26932.384422] Call Trace:
  [26932.384431]  [<ffffffff81051bef>] warn_slowpath_common+0x7f/0xc0
  [26932.384436]  [<ffffffff81051c4a>] warn_slowpath_null+0x1a/0x20
  [26932.384451]  [<ffffffffa02d32e6>] gen6_enable_rps+0x706/0x710 [i915]
  [26932.384466]  [<ffffffffa02bf3f6>] intel_modeset_init_hw+0x66/0xa0 [i915]
  [26932.384476]  [<ffffffffa02954b4>] i915_reset+0x1a4/0x6e0 [i915]
  [26932.384482]  [<ffffffff8101257b>] ? __switch_to+0x12b/0x420
  [26932.384493]  [<ffffffffa029a943>] i915_error_work_func+0xc3/0x110 [i915]
  [26932.384500]  [<ffffffff8107097a>] process_one_work+0x12a/0x420
  [26932.384511]  [<ffffffffa029a880>] ? gen6_pm_rps_work+0xe0/0xe0 [i915]
  [26932.384514]  [<ffffffff8107152e>] worker_thread+0x12e/0x2f0
  [26932.384517]  [<ffffffff81071400>] ? manage_workers.isra.26+0x200/0x200
  [26932.384521]  [<ffffffff81076023>] kthread+0x93/0xa0
  [26932.384526]  [<ffffffff8168a3e4>] kernel_thread_helper+0x4/0x10
  [26932.384531]  [<ffffffff81075f90>] ? kthread_freezable_should_stop+0x70/0x70
  [26932.384534]  [<ffffffff8168a3e0>] ? gs_change+0x13/0x13
  [26932.384536] ---[ end trace 59c6162fdfcbffef ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-26-generic 3.5.0-26.40
  ProcVersionSignature: Ubuntu 3.5.0-26.40-generic 3.5.7.6
  Uname: Linux 3.5.0-26-generic x86_64
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  luca       2084 F.... pulseaudio
  CheckboxSubmission: f8b82cd9bc23fe075e5068a9824afda5
  CheckboxSystem: b1865df84255b8716d3bcc269ff410d1
  Date: Sat Mar  2 22:25:14 2013
  HibernationDevice: RESUME=UUID=20fe6da8-7d68-4660-953f-6e4ae1d348a7
  InstallationDate: Installed on 2012-04-26 (310 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: TOSHIBA SATELLITE Z830
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-26-generic root=UUID=36929bf3-a158-44d9-a80d-3adac2840fa8 ro quiet splash acpi_backlight=vendor i915.i915_enable_rc6=1 i915.lvds_downclock=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-26-generic N/A
   linux-backports-modules-3.5.0-26-generic  N/A
   linux-firmware                            1.95
  SourcePackage: linux
  UpgradeStatus: Upgraded to quantal on 2012-10-28 (125 days ago)
  dmi.bios.date: 07/31/2012
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 1.70
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion1.70:bd07/31/2012:svnTOSHIBA:pnSATELLITEZ830:pvrPT22LE-00300GGR:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: SATELLITE Z830
  dmi.product.version: PT22LE-00300GGR
  dmi.sys.vendor: TOSHIBA

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