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[Leonid Evdokimov <leon+ubuntu@xxxxxxxxxxxx>]

Yep, I have seen hang on 13.10 too. Here are logs:
http://yadi.sk/d/psMKfJZi9cfoa

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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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