Leonid Evdokimov, thank you for reporting this bug and helping make Ubuntu 
better. This bug was reported a while ago and there hasn't been any activity in 
it recently. We were wondering if this is still an issue? Can you try with the 
latest development release of Ubuntu?  ISO CD images are available from 
http://cdimage.ubuntu.com/releases/ .
        
If it remains an issue, could you run the following command from a Terminal 
(Applications->Accessories->Terminal).  It will automatically gather and attach 
updated debug information to this report.
        
apport-collect -p linux <replace-with-bug-number>
        
Also, if you could test the latest upstream kernel available that would be 
great.  It will allow additional upstream developers to examine the issue.  
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds .  Once you've tested the 
upstream kernel, please remove the 'needs-upstream-testing' tag.  This can be 
done by clicking on the yellow pencil icon next to the tag located at the 
bottom of the bug description and deleting the 'needs-upstream-testing' text.  
Please let us know your results.
        
Thanks in advance.

** Summary changed:

- black screen and unusable Xorg due to kernel BUG at i915_gem.c:3336
+ kernel BUG at 
/build/buildd/linux-3.0.0/drivers/gpu/drm/i915/i915_gem.c:3336!; RIP: 
0010:[<ffffffffa00fa29b>]  [<ffffffffa00fa29b>] i915_gem_object_unpin+0xab/0xb0 
[i915]

** Tags added: needs-upstream-testing

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/842954

Title:
  kernel BUG at
  /build/buildd/linux-3.0.0/drivers/gpu/drm/i915/i915_gem.c:3336!; RIP:
  0010:[<ffffffffa00fa29b>]  [<ffffffffa00fa29b>]
  i915_gem_object_unpin+0xab/0xb0 [i915]

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