[Bug 64841] Linux hangs when suspending to disk

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=64841

--- Comment #12 from Ben Widawsky <ben at bwidawsk.net> ---
Milan, can you also try to reproduce this on our development branch? I've tried
it on two sandybridge machines, and cannot reproduce. I wonder if we've managed
to fix it in some other way already.
http://cgit.freedesktop.org/~danvet/drm-intel/log/?h=drm-intel-nightly

Takashi, the only issue I have with your approach is I am afraid we're just
ignoring corruption that will manifest itself in some other way later. I
suppose if we're lucky, we always end up doing a read, and we therefore won't
corrupt memory - but unless someone has the time and proficiency to prove we're
not corrupting memory, I think it's a dangerous fix (I think trading an obvious
failure for a non-obvious one is a step up).

Daniel, the stolen memory approach seems good as long as we make sure it's not
a piece of stolen memory used by anything else. I can't say I am surprised that
we've found yet another thing that makes Sandybridge unhappy. I would like to
know what Windows does, since I tested their "quiescing" method in Takashi's
original bug, andit demonstrably did not work.

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