** Description changed:

  Sometimes (usually once or twice a day) the screen goes completely off
  and can't be turned back on. The rest of the system seems to be running
  normally (not 100% sure about this, since I can't see anything). Only
  way to restore it is hard reboot.
  
  Not sure what triggers this, it seems quite random to me. Most of the
  time when this happens (not always though), is when some app that uses
  opengl is running.
  
  I'm using ubuntu 12.04 with unity-2d. My graphics card is: "Intel
  Corporation Mobile GM965/GL960 Integrated Graphics Controller".
  
- 
  bug 507504

** Description changed:

+ May 21 14:35:36 ghostdog kernel: [100010.488058] [drm:i915_hangcheck_elapsed] 
*ERROR* Hangcheck timer elapsed... GPU hung
+ May 21 14:35:36 ghostdog kernel: [100010.488071] [drm] capturing error event; 
look for more information in /debug/dri/0/i915_error_state
+ May 21 14:35:36 ghostdog kernel: [100010.489481] [drm:i915_wait_request] 
*ERROR* i915_wait_request returns -11 (awaiting 2272058 at 2272030, next 
2272083)
+ May 21 14:35:36 ghostdog kernel: [100010.490408] [drm:init_ring_common] 
*ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 
00000000 start 00000000
+ May 21 14:35:36 ghostdog kernel: [100010.490941] [drm] Changing LVDS panel 
from (+hsync, +vsync) to (-hsync, -vsync)
+ May 21 14:35:36 ghostdog kernel: [100010.491098] ------------[ cut here 
]------------
+ May 21 14:35:36 ghostdog kernel: [100010.491153] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:793 
intel_enable_pipe+0x144/0x150 [i915]()
+ May 21 14:35:36 ghostdog kernel: [100010.491161] Hardware name: 7650DHU
+ May 21 14:35:36 ghostdog kernel: [100010.491165] PLL state assertion failure 
(expected on, current off)
+ May 21 14:35:36 ghostdog kernel: [100010.491170] Modules linked in: cdc_acm 
nls_iso8859_1 nls_cp437 vfat fat usb_storage snd_hrtimer bnep rfcomm parport_pc 
ppdev binfmt_misc arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event snd_seq psmouse snd_timer 
serio_raw snd_seq_device thinkpad_acpi nvram iwl4965 iwl_legacy yenta_socket 
pcmcia_rsrc pcmcia_core mac80211 btusb cfg80211 mac_hid bluetooth snd i915 
drm_kms_helper drm i2c_algo_bit coretemp video soundcore snd_page_alloc lp 
parport tg3 [last unloaded: cdc_acm]
+ May 21 14:35:36 ghostdog kernel: [100010.491276] Pid: 11567, comm: 
kworker/u:1 Tainted: G        W    3.2.0-24-generic #37-Ubuntu
+ May 21 14:35:36 ghostdog kernel: [100010.491283] Call Trace:
+ May 21 14:35:36 ghostdog kernel: [100010.491302]  [<c104b182>] 
warn_slowpath_common+0x72/0xa0
+ May 21 14:35:36 ghostdog kernel: [100010.491345]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491386]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491396]  [<c104b253>] 
warn_slowpath_fmt+0x33/0x40
+ May 21 14:35:36 ghostdog kernel: [100010.491438]  [<f8355744>] 
intel_enable_pipe+0x144/0x150 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491484]  [<f8358988>] 
i9xx_crtc_mode_set+0x688/0xc60 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491518]  [<f82075ec>] ? 
vblank_disable_and_save+0x16c/0x190 [drm]
+ May 21 14:35:36 ghostdog kernel: [100010.491561]  [<f83522bc>] 
intel_crtc_mode_set+0x5c/0x90 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491581]  [<f8140b72>] 
drm_crtc_helper_set_mode+0x2a2/0x470 [drm_kms_helper]
+ May 21 14:35:36 ghostdog kernel: [100010.491606]  [<f8140dad>] 
drm_helper_resume_force_mode+0x6d/0x140 [drm_kms_helper]
+ May 21 14:35:36 ghostdog kernel: [100010.491639]  [<f8334231>] 
i915_reset+0x211/0x2d0 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491672]  [<f83385fe>] 
i915_error_work_func+0xae/0xf0 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491692]  [<c10652a1>] 
process_one_work+0x101/0x3a0
+ May 21 14:35:36 ghostdog kernel: [100010.491703]  [<c1577359>] ? 
apic_timer_interrupt+0x31/0x38
+ May 21 14:35:36 ghostdog kernel: [100010.491736]  [<f8338550>] ? 
i915_driver_irq_postinstall+0x170/0x170 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.491746]  [<c1065d64>] 
worker_thread+0x124/0x2d0
+ May 21 14:35:36 ghostdog kernel: [100010.491756]  [<c1065c40>] ? 
manage_workers.isra.27+0x110/0x110
+ May 21 14:35:36 ghostdog kernel: [100010.491766]  [<c1069b8d>] 
kthread+0x6d/0x80
+ May 21 14:35:36 ghostdog kernel: [100010.491774]  [<c1069b20>] ? 
flush_kthread_worker+0x80/0x80
+ May 21 14:35:36 ghostdog kernel: [100010.491784]  [<c157e37e>] 
kernel_thread_helper+0x6/0x10
+ May 21 14:35:36 ghostdog kernel: [100010.491791] ---[ end trace 
69f94361aa03fe13 ]---
+ May 21 14:35:36 ghostdog kernel: [100010.600100] ------------[ cut here 
]------------
+ May 21 14:35:36 ghostdog kernel: [100010.600126] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:930 
assert_pipe+0x75/0x80 [i915]()
+ May 21 14:35:36 ghostdog kernel: [100010.600129] Hardware name: 7650DHU
+ May 21 14:35:36 ghostdog kernel: [100010.600131] pipe B assertion failure 
(expected on, current off)
+ May 21 14:35:36 ghostdog kernel: [100010.600139] Modules linked in: cdc_acm 
nls_iso8859_1 nls_cp437 vfat fat usb_storage snd_hrtimer bnep rfcomm parport_pc 
ppdev binfmt_misc arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event snd_seq psmouse snd_timer 
serio_raw snd_seq_device thinkpad_acpi nvram iwl4965 iwl_legacy yenta_socket 
pcmcia_rsrc pcmcia_core mac80211 btusb cfg80211 mac_hid bluetooth snd i915 
drm_kms_helper drm i2c_algo_bit coretemp video soundcore snd_page_alloc lp 
parport tg3 [last unloaded: cdc_acm]
+ May 21 14:35:36 ghostdog kernel: [100010.600193] Pid: 11567, comm: 
kworker/u:1 Tainted: G        W    3.2.0-24-generic #37-Ubuntu
+ May 21 14:35:36 ghostdog kernel: [100010.600196] Call Trace:
+ May 21 14:35:36 ghostdog kernel: [100010.600205]  [<c104b182>] 
warn_slowpath_common+0x72/0xa0
+ May 21 14:35:36 ghostdog kernel: [100010.600226]  [<f83517c5>] ? 
assert_pipe+0x75/0x80 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600246]  [<f83517c5>] ? 
assert_pipe+0x75/0x80 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600251]  [<c104b253>] 
warn_slowpath_fmt+0x33/0x40
+ May 21 14:35:36 ghostdog kernel: [100010.600271]  [<f83517c5>] 
assert_pipe+0x75/0x80 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600294]  [<f8355776>] 
intel_enable_plane+0x26/0x80 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600317]  [<f83589b7>] 
i9xx_crtc_mode_set+0x6b7/0xc60 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600334]  [<f82075ec>] ? 
vblank_disable_and_save+0x16c/0x190 [drm]
+ May 21 14:35:36 ghostdog kernel: [100010.600355]  [<f83522bc>] 
intel_crtc_mode_set+0x5c/0x90 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600365]  [<f8140b72>] 
drm_crtc_helper_set_mode+0x2a2/0x470 [drm_kms_helper]
+ May 21 14:35:36 ghostdog kernel: [100010.600377]  [<f8140dad>] 
drm_helper_resume_force_mode+0x6d/0x140 [drm_kms_helper]
+ May 21 14:35:36 ghostdog kernel: [100010.600394]  [<f8334231>] 
i915_reset+0x211/0x2d0 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600410]  [<f83385fe>] 
i915_error_work_func+0xae/0xf0 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600421]  [<c10652a1>] 
process_one_work+0x101/0x3a0
+ May 21 14:35:36 ghostdog kernel: [100010.600427]  [<c1577359>] ? 
apic_timer_interrupt+0x31/0x38
+ May 21 14:35:36 ghostdog kernel: [100010.600443]  [<f8338550>] ? 
i915_driver_irq_postinstall+0x170/0x170 [i915]
+ May 21 14:35:36 ghostdog kernel: [100010.600448]  [<c1065d64>] 
worker_thread+0x124/0x2d0
+ May 21 14:35:36 ghostdog kernel: [100010.600453]  [<c1065c40>] ? 
manage_workers.isra.27+0x110/0x110
+ May 21 14:35:36 ghostdog kernel: [100010.600458]  [<c1069b8d>] 
kthread+0x6d/0x80
+ May 21 14:35:36 ghostdog kernel: [100010.600462]  [<c1069b20>] ? 
flush_kthread_worker+0x80/0x80
+ May 21 14:35:36 ghostdog kernel: [100010.600468]  [<c157e37e>] 
kernel_thread_helper+0x6/0x10
+ Ma
+ 
  Sometimes (usually once or twice a day) the screen goes completely off
  and can't be turned back on. The rest of the system seems to be running
  normally (not 100% sure about this, since I can't see anything). Only
  way to restore it is hard reboot.
  
  Not sure what triggers this, it seems quite random to me. Most of the
  time when this happens (not always though), is when some app that uses
  opengl is running.
  
  I'm using ubuntu 12.04 with unity-2d. My graphics card is: "Intel
  Corporation Mobile GM965/GL960 Integrated Graphics Controller".
  
  bug 507504

** Description changed:

  May 21 14:35:36 ghostdog kernel: [100010.488058] [drm:i915_hangcheck_elapsed] 
*ERROR* Hangcheck timer elapsed... GPU hung
  May 21 14:35:36 ghostdog kernel: [100010.488071] [drm] capturing error event; 
look for more information in /debug/dri/0/i915_error_state
  May 21 14:35:36 ghostdog kernel: [100010.489481] [drm:i915_wait_request] 
*ERROR* i915_wait_request returns -11 (awaiting 2272058 at 2272030, next 
2272083)
  May 21 14:35:36 ghostdog kernel: [100010.490408] [drm:init_ring_common] 
*ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 
00000000 start 00000000
  May 21 14:35:36 ghostdog kernel: [100010.490941] [drm] Changing LVDS panel 
from (+hsync, +vsync) to (-hsync, -vsync)
  May 21 14:35:36 ghostdog kernel: [100010.491098] ------------[ cut here 
]------------
  May 21 14:35:36 ghostdog kernel: [100010.491153] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:793 
intel_enable_pipe+0x144/0x150 [i915]()
  May 21 14:35:36 ghostdog kernel: [100010.491161] Hardware name: 7650DHU
  May 21 14:35:36 ghostdog kernel: [100010.491165] PLL state assertion failure 
(expected on, current off)
  May 21 14:35:36 ghostdog kernel: [100010.491170] Modules linked in: cdc_acm 
nls_iso8859_1 nls_cp437 vfat fat usb_storage snd_hrtimer bnep rfcomm parport_pc 
ppdev binfmt_misc arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event snd_seq psmouse snd_timer 
serio_raw snd_seq_device thinkpad_acpi nvram iwl4965 iwl_legacy yenta_socket 
pcmcia_rsrc pcmcia_core mac80211 btusb cfg80211 mac_hid bluetooth snd i915 
drm_kms_helper drm i2c_algo_bit coretemp video soundcore snd_page_alloc lp 
parport tg3 [last unloaded: cdc_acm]
  May 21 14:35:36 ghostdog kernel: [100010.491276] Pid: 11567, comm: 
kworker/u:1 Tainted: G        W    3.2.0-24-generic #37-Ubuntu
  May 21 14:35:36 ghostdog kernel: [100010.491283] Call Trace:
  May 21 14:35:36 ghostdog kernel: [100010.491302]  [<c104b182>] 
warn_slowpath_common+0x72/0xa0
  May 21 14:35:36 ghostdog kernel: [100010.491345]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491386]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491396]  [<c104b253>] 
warn_slowpath_fmt+0x33/0x40
  May 21 14:35:36 ghostdog kernel: [100010.491438]  [<f8355744>] 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491484]  [<f8358988>] 
i9xx_crtc_mode_set+0x688/0xc60 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491518]  [<f82075ec>] ? 
vblank_disable_and_save+0x16c/0x190 [drm]
  May 21 14:35:36 ghostdog kernel: [100010.491561]  [<f83522bc>] 
intel_crtc_mode_set+0x5c/0x90 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491581]  [<f8140b72>] 
drm_crtc_helper_set_mode+0x2a2/0x470 [drm_kms_helper]
  May 21 14:35:36 ghostdog kernel: [100010.491606]  [<f8140dad>] 
drm_helper_resume_force_mode+0x6d/0x140 [drm_kms_helper]
  May 21 14:35:36 ghostdog kernel: [100010.491639]  [<f8334231>] 
i915_reset+0x211/0x2d0 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491672]  [<f83385fe>] 
i915_error_work_func+0xae/0xf0 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491692]  [<c10652a1>] 
process_one_work+0x101/0x3a0
  May 21 14:35:36 ghostdog kernel: [100010.491703]  [<c1577359>] ? 
apic_timer_interrupt+0x31/0x38
  May 21 14:35:36 ghostdog kernel: [100010.491736]  [<f8338550>] ? 
i915_driver_irq_postinstall+0x170/0x170 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491746]  [<c1065d64>] 
worker_thread+0x124/0x2d0
  May 21 14:35:36 ghostdog kernel: [100010.491756]  [<c1065c40>] ? 
manage_workers.isra.27+0x110/0x110
  May 21 14:35:36 ghostdog kernel: [100010.491766]  [<c1069b8d>] 
kthread+0x6d/0x80
  May 21 14:35:36 ghostdog kernel: [100010.491774]  [<c1069b20>] ? 
flush_kthread_worker+0x80/0x80
  May 21 14:35:36 ghostdog kernel: [100010.491784]  [<c157e37e>] 
kernel_thread_helper+0x6/0x10
  May 21 14:35:36 ghostdog kernel: [100010.491791] ---[ end trace 
69f94361aa03fe13 ]---
- May 21 14:35:36 ghostdog kernel: [100010.600100] ------------[ cut here 
]------------
- May 21 14:35:36 ghostdog kernel: [100010.600126] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:930 
assert_pipe+0x75/0x80 [i915]()
- May 21 14:35:36 ghostdog kernel: [100010.600129] Hardware name: 7650DHU
- May 21 14:35:36 ghostdog kernel: [100010.600131] pipe B assertion failure 
(expected on, current off)
- May 21 14:35:36 ghostdog kernel: [100010.600139] Modules linked in: cdc_acm 
nls_iso8859_1 nls_cp437 vfat fat usb_storage snd_hrtimer bnep rfcomm parport_pc 
ppdev binfmt_misc arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event snd_seq psmouse snd_timer 
serio_raw snd_seq_device thinkpad_acpi nvram iwl4965 iwl_legacy yenta_socket 
pcmcia_rsrc pcmcia_core mac80211 btusb cfg80211 mac_hid bluetooth snd i915 
drm_kms_helper drm i2c_algo_bit coretemp video soundcore snd_page_alloc lp 
parport tg3 [last unloaded: cdc_acm]
- May 21 14:35:36 ghostdog kernel: [100010.600193] Pid: 11567, comm: 
kworker/u:1 Tainted: G        W    3.2.0-24-generic #37-Ubuntu
- May 21 14:35:36 ghostdog kernel: [100010.600196] Call Trace:
- May 21 14:35:36 ghostdog kernel: [100010.600205]  [<c104b182>] 
warn_slowpath_common+0x72/0xa0
- May 21 14:35:36 ghostdog kernel: [100010.600226]  [<f83517c5>] ? 
assert_pipe+0x75/0x80 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600246]  [<f83517c5>] ? 
assert_pipe+0x75/0x80 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600251]  [<c104b253>] 
warn_slowpath_fmt+0x33/0x40
- May 21 14:35:36 ghostdog kernel: [100010.600271]  [<f83517c5>] 
assert_pipe+0x75/0x80 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600294]  [<f8355776>] 
intel_enable_plane+0x26/0x80 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600317]  [<f83589b7>] 
i9xx_crtc_mode_set+0x6b7/0xc60 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600334]  [<f82075ec>] ? 
vblank_disable_and_save+0x16c/0x190 [drm]
- May 21 14:35:36 ghostdog kernel: [100010.600355]  [<f83522bc>] 
intel_crtc_mode_set+0x5c/0x90 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600365]  [<f8140b72>] 
drm_crtc_helper_set_mode+0x2a2/0x470 [drm_kms_helper]
- May 21 14:35:36 ghostdog kernel: [100010.600377]  [<f8140dad>] 
drm_helper_resume_force_mode+0x6d/0x140 [drm_kms_helper]
- May 21 14:35:36 ghostdog kernel: [100010.600394]  [<f8334231>] 
i915_reset+0x211/0x2d0 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600410]  [<f83385fe>] 
i915_error_work_func+0xae/0xf0 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600421]  [<c10652a1>] 
process_one_work+0x101/0x3a0
- May 21 14:35:36 ghostdog kernel: [100010.600427]  [<c1577359>] ? 
apic_timer_interrupt+0x31/0x38
- May 21 14:35:36 ghostdog kernel: [100010.600443]  [<f8338550>] ? 
i915_driver_irq_postinstall+0x170/0x170 [i915]
- May 21 14:35:36 ghostdog kernel: [100010.600448]  [<c1065d64>] 
worker_thread+0x124/0x2d0
- May 21 14:35:36 ghostdog kernel: [100010.600453]  [<c1065c40>] ? 
manage_workers.isra.27+0x110/0x110
- May 21 14:35:36 ghostdog kernel: [100010.600458]  [<c1069b8d>] 
kthread+0x6d/0x80
- May 21 14:35:36 ghostdog kernel: [100010.600462]  [<c1069b20>] ? 
flush_kthread_worker+0x80/0x80
- May 21 14:35:36 ghostdog kernel: [100010.600468]  [<c157e37e>] 
kernel_thread_helper+0x6/0x10
- Ma
  
  Sometimes (usually once or twice a day) the screen goes completely off
  and can't be turned back on. The rest of the system seems to be running
  normally (not 100% sure about this, since I can't see anything). Only
  way to restore it is hard reboot.
  
  Not sure what triggers this, it seems quite random to me. Most of the
  time when this happens (not always though), is when some app that uses
  opengl is running.
  
  I'm using ubuntu 12.04 with unity-2d. My graphics card is: "Intel
  Corporation Mobile GM965/GL960 Integrated Graphics Controller".
  
  bug 507504

** Description changed:

  May 21 14:35:36 ghostdog kernel: [100010.488058] [drm:i915_hangcheck_elapsed] 
*ERROR* Hangcheck timer elapsed... GPU hung
  May 21 14:35:36 ghostdog kernel: [100010.488071] [drm] capturing error event; 
look for more information in /debug/dri/0/i915_error_state
  May 21 14:35:36 ghostdog kernel: [100010.489481] [drm:i915_wait_request] 
*ERROR* i915_wait_request returns -11 (awaiting 2272058 at 2272030, next 
2272083)
  May 21 14:35:36 ghostdog kernel: [100010.490408] [drm:init_ring_common] 
*ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 
00000000 start 00000000
  May 21 14:35:36 ghostdog kernel: [100010.490941] [drm] Changing LVDS panel 
from (+hsync, +vsync) to (-hsync, -vsync)
  May 21 14:35:36 ghostdog kernel: [100010.491098] ------------[ cut here 
]------------
  May 21 14:35:36 ghostdog kernel: [100010.491153] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:793 
intel_enable_pipe+0x144/0x150 [i915]()
  May 21 14:35:36 ghostdog kernel: [100010.491161] Hardware name: 7650DHU
  May 21 14:35:36 ghostdog kernel: [100010.491165] PLL state assertion failure 
(expected on, current off)
  May 21 14:35:36 ghostdog kernel: [100010.491170] Modules linked in: cdc_acm 
nls_iso8859_1 nls_cp437 vfat fat usb_storage snd_hrtimer bnep rfcomm parport_pc 
ppdev binfmt_misc arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event snd_seq psmouse snd_timer 
serio_raw snd_seq_device thinkpad_acpi nvram iwl4965 iwl_legacy yenta_socket 
pcmcia_rsrc pcmcia_core mac80211 btusb cfg80211 mac_hid bluetooth snd i915 
drm_kms_helper drm i2c_algo_bit coretemp video soundcore snd_page_alloc lp 
parport tg3 [last unloaded: cdc_acm]
  May 21 14:35:36 ghostdog kernel: [100010.491276] Pid: 11567, comm: 
kworker/u:1 Tainted: G        W    3.2.0-24-generic #37-Ubuntu
  May 21 14:35:36 ghostdog kernel: [100010.491283] Call Trace:
  May 21 14:35:36 ghostdog kernel: [100010.491302]  [<c104b182>] 
warn_slowpath_common+0x72/0xa0
  May 21 14:35:36 ghostdog kernel: [100010.491345]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491386]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491396]  [<c104b253>] 
warn_slowpath_fmt+0x33/0x40
  May 21 14:35:36 ghostdog kernel: [100010.491438]  [<f8355744>] 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491484]  [<f8358988>] 
i9xx_crtc_mode_set+0x688/0xc60 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491518]  [<f82075ec>] ? 
vblank_disable_and_save+0x16c/0x190 [drm]
  May 21 14:35:36 ghostdog kernel: [100010.491561]  [<f83522bc>] 
intel_crtc_mode_set+0x5c/0x90 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491581]  [<f8140b72>] 
drm_crtc_helper_set_mode+0x2a2/0x470 [drm_kms_helper]
  May 21 14:35:36 ghostdog kernel: [100010.491606]  [<f8140dad>] 
drm_helper_resume_force_mode+0x6d/0x140 [drm_kms_helper]
  May 21 14:35:36 ghostdog kernel: [100010.491639]  [<f8334231>] 
i915_reset+0x211/0x2d0 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491672]  [<f83385fe>] 
i915_error_work_func+0xae/0xf0 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491692]  [<c10652a1>] 
process_one_work+0x101/0x3a0
  May 21 14:35:36 ghostdog kernel: [100010.491703]  [<c1577359>] ? 
apic_timer_interrupt+0x31/0x38
  May 21 14:35:36 ghostdog kernel: [100010.491736]  [<f8338550>] ? 
i915_driver_irq_postinstall+0x170/0x170 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491746]  [<c1065d64>] 
worker_thread+0x124/0x2d0
  May 21 14:35:36 ghostdog kernel: [100010.491756]  [<c1065c40>] ? 
manage_workers.isra.27+0x110/0x110
  May 21 14:35:36 ghostdog kernel: [100010.491766]  [<c1069b8d>] 
kthread+0x6d/0x80
  May 21 14:35:36 ghostdog kernel: [100010.491774]  [<c1069b20>] ? 
flush_kthread_worker+0x80/0x80
  May 21 14:35:36 ghostdog kernel: [100010.491784]  [<c157e37e>] 
kernel_thread_helper+0x6/0x10
  May 21 14:35:36 ghostdog kernel: [100010.491791] ---[ end trace 
69f94361aa03fe13 ]---
  
  Sometimes (usually once or twice a day) the screen goes completely off
  and can't be turned back on. The rest of the system seems to be running
  normally (not 100% sure about this, since I can't see anything). Only
  way to restore it is hard reboot.
  
  Not sure what triggers this, it seems quite random to me. Most of the
  time when this happens (not always though), is when some app that uses
  opengl is running.
  
  I'm using ubuntu 12.04 with unity-2d. My graphics card is: "Intel
  Corporation Mobile GM965/GL960 Integrated Graphics Controller".
  
- bug 507504
+ bug 507504  bug 881867

** Description changed:

+ [39805.130277] [drm:i915_wait_request] *ERROR* something (likely
+ vbetool) disabled interrupts, re-enabling
+ 
+ 
  May 21 14:35:36 ghostdog kernel: [100010.488058] [drm:i915_hangcheck_elapsed] 
*ERROR* Hangcheck timer elapsed... GPU hung
  May 21 14:35:36 ghostdog kernel: [100010.488071] [drm] capturing error event; 
look for more information in /debug/dri/0/i915_error_state
  May 21 14:35:36 ghostdog kernel: [100010.489481] [drm:i915_wait_request] 
*ERROR* i915_wait_request returns -11 (awaiting 2272058 at 2272030, next 
2272083)
  May 21 14:35:36 ghostdog kernel: [100010.490408] [drm:init_ring_common] 
*ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 
00000000 start 00000000
  May 21 14:35:36 ghostdog kernel: [100010.490941] [drm] Changing LVDS panel 
from (+hsync, +vsync) to (-hsync, -vsync)
  May 21 14:35:36 ghostdog kernel: [100010.491098] ------------[ cut here 
]------------
  May 21 14:35:36 ghostdog kernel: [100010.491153] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:793 
intel_enable_pipe+0x144/0x150 [i915]()
  May 21 14:35:36 ghostdog kernel: [100010.491161] Hardware name: 7650DHU
  May 21 14:35:36 ghostdog kernel: [100010.491165] PLL state assertion failure 
(expected on, current off)
  May 21 14:35:36 ghostdog kernel: [100010.491170] Modules linked in: cdc_acm 
nls_iso8859_1 nls_cp437 vfat fat usb_storage snd_hrtimer bnep rfcomm parport_pc 
ppdev binfmt_misc arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event snd_seq psmouse snd_timer 
serio_raw snd_seq_device thinkpad_acpi nvram iwl4965 iwl_legacy yenta_socket 
pcmcia_rsrc pcmcia_core mac80211 btusb cfg80211 mac_hid bluetooth snd i915 
drm_kms_helper drm i2c_algo_bit coretemp video soundcore snd_page_alloc lp 
parport tg3 [last unloaded: cdc_acm]
  May 21 14:35:36 ghostdog kernel: [100010.491276] Pid: 11567, comm: 
kworker/u:1 Tainted: G        W    3.2.0-24-generic #37-Ubuntu
  May 21 14:35:36 ghostdog kernel: [100010.491283] Call Trace:
  May 21 14:35:36 ghostdog kernel: [100010.491302]  [<c104b182>] 
warn_slowpath_common+0x72/0xa0
  May 21 14:35:36 ghostdog kernel: [100010.491345]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491386]  [<f8355744>] ? 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491396]  [<c104b253>] 
warn_slowpath_fmt+0x33/0x40
  May 21 14:35:36 ghostdog kernel: [100010.491438]  [<f8355744>] 
intel_enable_pipe+0x144/0x150 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491484]  [<f8358988>] 
i9xx_crtc_mode_set+0x688/0xc60 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491518]  [<f82075ec>] ? 
vblank_disable_and_save+0x16c/0x190 [drm]
  May 21 14:35:36 ghostdog kernel: [100010.491561]  [<f83522bc>] 
intel_crtc_mode_set+0x5c/0x90 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491581]  [<f8140b72>] 
drm_crtc_helper_set_mode+0x2a2/0x470 [drm_kms_helper]
  May 21 14:35:36 ghostdog kernel: [100010.491606]  [<f8140dad>] 
drm_helper_resume_force_mode+0x6d/0x140 [drm_kms_helper]
  May 21 14:35:36 ghostdog kernel: [100010.491639]  [<f8334231>] 
i915_reset+0x211/0x2d0 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491672]  [<f83385fe>] 
i915_error_work_func+0xae/0xf0 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491692]  [<c10652a1>] 
process_one_work+0x101/0x3a0
  May 21 14:35:36 ghostdog kernel: [100010.491703]  [<c1577359>] ? 
apic_timer_interrupt+0x31/0x38
  May 21 14:35:36 ghostdog kernel: [100010.491736]  [<f8338550>] ? 
i915_driver_irq_postinstall+0x170/0x170 [i915]
  May 21 14:35:36 ghostdog kernel: [100010.491746]  [<c1065d64>] 
worker_thread+0x124/0x2d0
  May 21 14:35:36 ghostdog kernel: [100010.491756]  [<c1065c40>] ? 
manage_workers.isra.27+0x110/0x110
  May 21 14:35:36 ghostdog kernel: [100010.491766]  [<c1069b8d>] 
kthread+0x6d/0x80
  May 21 14:35:36 ghostdog kernel: [100010.491774]  [<c1069b20>] ? 
flush_kthread_worker+0x80/0x80
  May 21 14:35:36 ghostdog kernel: [100010.491784]  [<c157e37e>] 
kernel_thread_helper+0x6/0x10
  May 21 14:35:36 ghostdog kernel: [100010.491791] ---[ end trace 
69f94361aa03fe13 ]---
  
  Sometimes (usually once or twice a day) the screen goes completely off
  and can't be turned back on. The rest of the system seems to be running
  normally (not 100% sure about this, since I can't see anything). Only
  way to restore it is hard reboot.
  
  Not sure what triggers this, it seems quite random to me. Most of the
  time when this happens (not always though), is when some app that uses
  opengl is running.
  
  I'm using ubuntu 12.04 with unity-2d. My graphics card is: "Intel
  Corporation Mobile GM965/GL960 Integrated Graphics Controller".
  
  bug 507504  bug 881867

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https://bugs.launchpad.net/bugs/1002284

Title:
  [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU
  hung

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