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  1. Bug #603064
  2. Comment #41

Comment 41 for bug 603064

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madbiologist (me-again) wrote : Re: [i965gm] GPU lockup 77c6dfe5

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