[Bug 95632] [BAT SKL] *ERROR* Potential atomic update failure on pipe A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95632

--- Comment #6 from Damien Grassart <damien at grassart.com> ---
I am also seeing this error message on my i7-4500U laptop and was able to
bisect it to this commit:

92dcc67c11d51671cca8df543e25c601e52336ad is the first bad commit
commit 92dcc67c11d51671cca8df543e25c601e52336ad
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Apr 28 09:56:46 2016 +0100

    drm/i915: Unify intel_ring_begin()

    Combine the near identical implementations of intel_logical_ring_begin()
    and intel_ring_begin() - the only difference is that the logical wait
    has to check for a matching ring (which is assumed by legacy).

    In the process some debug messages are culled as there were following a
    WARN if we hit an actual error.

    v2: Updated commentary

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
    Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-12-git-send-email-chris@chris-wilson.co.uk
    (cherry picked from commit 987046ad65361a8b038fbf8d76d152237fb7acf1)
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

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