[Bug 58107] [sna gm45] Lockups in X on 2.20.15, flip-vs-dpms? race

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58107

--- Comment #9 from Elvis Pranskevichus <el at prans.net> ---
That branch doesn't boot for me as is, but I cherry-picked commits that seemed
to contain mb() insertions on top of 3.7:

* drm/i915: Insert a full mb() before reading the seqno from the status page
* drm/i915: Review the memory barriers around CPU access to buffers
* overlay mb()

Is that it, or is there something else in that branch that may be relevant?

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