[Bug 64841] Linux hangs when suspending to disk

[bugzilla-daemon at bugzilla.kernel.org]

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

--- Comment #8 from Ben Widawsky <ben at bwidawsk.net> ---
(In reply to Milan Plzik from comment #7)
> As for me (I have not yet done any tests, since this is also my production
> laptop):
> 
> 1) 3.6.11 worked fine for me. 

I hope you mean 3.11.6

I'm seeing some pixmap corruption in X and
> chromium, but that might be more because of userspace components, and I also
> often see "[drm:ring_stuck] *ERROR* Kicking stuck wait on render ring" when
> using DisplayPort monitor, but I hope  that's another issue.

I primarily meant outside of gfx domain. It would be likely to see fs
corruption for example. Depending on your system, it might be unlikely to see
this corruption without using various memory debugging tools. My fear is we've
traded silent memory corruption for hangs.

> 
> 2) I hope I'll find some time to test this during weekend

Do you have the same symptom, ie you laste see: "[drm] Enabling RC6 states: RC6
on, RC6p off, RC6pp off." Have you done the bisect to my commit also?

> 
> 3) PCI ID is:
> 
> 00:02.0 0300: 8086:0126 (rev 09) (prog-if 00 [VGA controller])
> 
> 4) S3 works fine for me, I use it as an alternative for S4.

This patch sadly/ironically, is what fixes S4 on HSW.

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