I just tried the new mesa* packages in Fedora 15 updates-testing on my
Sandy Bridge (Core i7 2600) system, and the results were not pretty.
X was completely unusable, with both of my screens "flashing" solid
black every few seconds.

These messages appeared in the syslog:

Mar 30 06:24:23 ian kernel: [ 4.755194] [drm] Initialized i915 1.6.0
20080730 for 0000:00:02.0 on minor 0
Mar 30 06:25:55 ian kernel: [ 284.567706] [drm:i915_hangcheck_elapsed]
*ERROR* Hangcheck timer elapsed... GPU hung
Mar 30 06:25:55 ian kernel: [ 284.569394] [drm:i915_do_wait_request]
*ERROR* i915_do_wait_request returns -11 (awaiting 16876 at 16863, next
16877)
Mar 30 06:26:03 ian kernel: [ 292.376873] [drm:i915_hangcheck_elapsed]
*ERROR* Hangcheck timer elapsed... GPU hung
Mar 30 06:26:03 ian kernel: [ 292.376901] [drm:i915_do_wait_request]
*ERROR* i915_do_wait_request returns -11 (awaiting 18211 at 18203, next
18212)
Mar 30 06:26:11 ian kernel: [ 300.114203] [drm:i915_hangcheck_elapsed]
*ERROR* Hangcheck timer elapsed... GPU hung
Mar 30 06:26:11 ian kernel: [ 300.114242] [drm:i915_do_wait_request]
*ERROR* i915_do_wait_request returns -11 (awaiting 19295 at 19287, next
19296)
Mar 30 06:26:51 ian kernel: [ 340.625444] [drm:i915_hangcheck_elapsed]
*ERROR* Hangcheck timer elapsed... GPU hung
Mar 30 06:26:51 ian kernel: [ 340.625472] [drm:i915_do_wait_request]
*ERROR* i915_do_wait_request returns -11 (awaiting 44809 at 44798, next
44810)

--
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Ian Pilcher arequipeno@gmail.com
"If you're going to shift my paradigm ... at least buy me dinner first."
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Hello!

2011/3/30 Ian Pilcher <arequipeno@gmail.com>:
> I just tried the new mesa* packages in Fedora 15 updates-testing on my
> Sandy Bridge (Core i7 2600) system, and the results were not pretty.
> X was completely unusable, with both of my screens "flashing" solid
> black every few seconds.

I encountered similar issue. See this bugreport:

https://bugzilla.redhat.com/show_bug.cgi?id=684097

In my case I just downgraded to older kernel.

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With best regards, Peter Lemenkov.
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