Thanks @Nick Demou ! I followed your instructions. Thanks a lot, it seems
fixed... :)


2013/4/28 Nick Demou <email address hidden>

> seems also fixed for me after installing kernel 3.5.0-28-generic from
> precise-proposed (at least after the first 3 hours of testing). Many
> thanks to all who helped.
>
> uname -a
> Linux ndXPS13 3.5.0-28-generic #48~precise1-Ubuntu SMP Wed Apr 24 21:43:05
> UTC 2013 i686 i686 i386 GNU/Linux
>
> cat /etc/lsb-release
> DISTRIB_ID=Ubuntu
> DISTRIB_RELEASE=12.04
> DISTRIB_CODENAME=precise
> DISTRIB_DESCRIPTION="Ubuntu 12.04.2 LTS"
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> 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 “linux” package in Ubuntu:
>   Invalid
> Status in “linux-lts-quantal” package in Ubuntu:
>   Invalid
> Status in “linux” source package in Precise:
>   Fix Committed
> Status in “linux-lts-quantal” source package in Precise:
>   Confirmed
> Status in “linux” source package in Quantal:
>   Fix Committed
> Status in “linux-lts-quantal” source package in Quantal:
>   Invalid
> Status in “linux” source package in Raring:
>   Invalid
> Status in “linux-lts-quantal” source package in Raring:
>   Invalid
>
> 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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>