[Bug 597075] Re: 2.6.35 hangs at boot due to regression in i915 or intel_agp

[Leann Ogasawara]

9a7e849 boots successfully.  Marking it good which points to 9908ff7 as
being the culprit.  I've built two final test kernels.  The first is a
mainline 2.6.35-rc3 kernel with just the offending commit reverted:

http://people.canonical.com/~ogasawara/lp597075/2.6.35-rc3-9908ff7/

The second is the latest Maverick 2.6.35-6.7 kernel (which is based on
mainline 2.6.35-rc3) with the offending commit reverted:

http://people.canonical.com/~ogasawara/lp597075/2.6.35-6.7-9908ff7/

Please test both and let me know your results.  Thanks.

~/linux-2.6$ git bisect good
9908ff736adf261e749b4887486a32ffa209304c is the first bad commit
commit 9908ff736adf261e749b4887486a32ffa209304c
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat May 15 09:57:03 2010 +0100

    drm/i915: Kill dangerous pending-flip debugging
    
    We can, by virtue of a vblank interrupt firing in the middle of setting
    up the unpin work (i.e. after we set the unpin_work field and before we
    write to the ringbuffer) enter intel_finish_page_flip() prior to
    receiving the pending flip notification. Therefore we can expect to hit
    intel_finish_page_flip() under normal circumstances without a pending flip
    and even without installing the pending_flip_obj. This is exacerbated by
    aperture thrashing whilst binding the framebuffer
    
    References:
    
      Bug 28079 - "glresize" causes kernel panic in intel_finish_page_flip.
      https://bugs.freedesktop.org/show_bug.cgi?id=28079
    
    Reported-by: Nick Bowler <nbowler at draconx.ca>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
    Cc: stable at kernel.org
    Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Signed-off-by: Eric Anholt <eric at anholt.net>

:040000 040000 8472a2b84c676e3c714e8c1f8392255b1959ae83
bd59f09180a36d398f7d0e63060851582593c14d M      drivers


** Bug watch added: freedesktop.org Bugzilla #28079
   http://bugs.freedesktop.org/show_bug.cgi?id=28079

-- 
2.6.35 hangs at boot due to regression in i915 or intel_agp
https://bugs.launchpad.net/bugs/597075
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