[Bug 54575] [GM45] boot-up broken in kernel 3.4.10 - screen stays blank (bad patch identified)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54575

--- Comment #14 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #13)
> Anyway, with the change to drm.debug=6 I can't seem to be able to reproduce
> the blank screen - is it possible that additional latencies through that
> option are influencing ring init?

Yes. No idea why, the posting reads seemed to be the most sensible attempt to
introduce some delays along with the write barriers. What you can try is to
just put the entire init in a loop and repeat say 10 times until it works.

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