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[klabog <711999@xxxxxxxxxxxxxxxxxx>]

Sorry, I'm not really comfortable with this bug reports - only wonder if this should be solved now or not? Just installed Natty and have irregular crashes with this lines in my syslog:
May  3 12:45:49 Dell4 kernel: [  843.344142] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
May  3 12:45:49 Dell4 kernel: [  843.345510] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 156952 at 156947, next 156953)
May  3 12:45:49 Dell4 kernel: [  843.345972] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 00000000 start 00000000
May  3 12:45:50 Dell4 kernel: [  843.648751] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
May  3 12:45:50 Dell4 kernel: [  843.668746] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
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same lines cut
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May  3 12:45:55 Dell4 kernel: [  849.429197] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
May  3 12:45:56 Dell4 kernel: [  849.589198] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
May  3 12:45:56 Dell4 kernel: [  849.600134] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
May  3 12:45:56 Dell4 kernel: [  849.600211] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 156959 at 156947, next 156960)
May  3 12:45:56 Dell4 kernel: [  849.600627] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 00000000 start 00000000
May  3 12:45:56 Dell4 kernel: [  849.968744] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
May  3 12:45:56 Dell4 kernel: [  849.989004] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
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same lines cut
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May  3 12:45:57 Dell4 kernel: [  851.329090] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
May  3 12:45:57 Dell4 kernel: [  851.348193] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
May  3 12:45:57 Dell4 kernel: [  851.348265] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 156960 at 156947, next 156961)
May  3 12:45:57 Dell4 kernel: [  851.348684] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
May  3 12:45:57 Dell4 kernel: [  851.348695] [drm:i915_reset] *ERROR* Failed to reset chip.
May  3 12:45:57 Dell4 kernel: [  851.418608] compiz[1527]: segfault at 8 ip b70843f1 sp bfdf5c10 error 6 in libc-2.13.so[b6f6f000+15a000]
May  3 12:46:16 Dell4 kernel: [  869.504282] composite sync not supported
May  3 12:46:29 Dell4 acpid: client 1130[0:0] has disconnected

While I was testing with "Live System" there was no problem at all on my machine. 
Then I installed with "Alternate" to get an encrypted LVM and get on every start the message "No video mode set" which seemed to be from BIOS. System started then but crashed after some minutes without any visible reason. There was no way to work with it.
Installed from scratch with "Desktop edition" got no error message on starting up but after some time (longer than before) it crashed and I copied the syslog. Just now I'm working with the system and since an hour there was no problem. I hopefully will be able to finish this report.
I use a Dell Inspiron 1525 until now (Hardy / Karmic) with no problems.

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https://bugs.launchpad.net/bugs/711999

Title:
  [i915g] GPU lockup - (ESR: 0x00000001 IPEHR: 0x02000011) Hangcheck
  timer elapsed... failed to reset chip