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[madbiologist <603064@xxxxxxxxxxxxxxxxxx>]

I found this in the upstream kernel 2.6.37-rc1 changelog:

commit 4b60e5cb707aa1d44fd01680296a2caf45dd6fae
Author: Chris Wilson
Date:   Sun Aug 8 11:53:53 2010 +0100

    drm/i915: Clear scanline waits after disabling the pipe.
    
    If we disable the pipe and the GPU is currently waiting on a scanline
    WAIT_FOR_EVENT, the GPU will hang. Fortunately, there is a magic bit
    which we can write on i915+ to break this wait after disabling the
    pipe.
    
    References:
    
      Bug 29252 - [Arrandale] Hung WAIT_FOR_EVENT when running rss-glx-skyrocket
      https://bugs.freedesktop.org/show_bug.cgi?id=29252
    
      Bug 28964 - [i965gm] GPU infinite MI_WAIT_FOR_EVENT while watching video in Totem
      https://bugs.freedesktop.org/show_bug.cgi?id=28964
    
    and many others.
    
    Signed-off-by: Chris Wilson
    Cc: Jesse Barnes

** Bug watch added: freedesktop.org Bugzilla #29252
   http://bugs.freedesktop.org/show_bug.cgi?id=29252

-- 
[i965gm] GPU lockup 77c6dfe5
https://bugs.launchpad.net/bugs/603064
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