[Bug 56139] [bisected] kernel 3.7.0-rc1 breaks 6950 (boot/grub2 and suspend/resume) (CAYMAN)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56139

--- Comment #51 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #50)
> (In reply to comment #49)
> > What if the problem is not from this code, but underneath? I'll try to
> > suspend and resume without having Xorg running. Would that help in any way?
> 
> If the commit you bisected is actually the culprit, this is an issue with
> the memory controller and the displays on the GPU.  When we reprogram the
> memory controller we need to stop all the GPU memory clients.  We used to
> disable the display controllers but this caused additional flicker on boot
> up and caused hangs on some cards.  So we switched to the current method
> which was recommended by the hardware team.  This avoids the flicker by just
> stopping the MC interface in the displays but leaving them enabled and also
> fixes hangs related to this on a number of chips.  Unfortunately, it seems
> to cause other problems in certain causes.

Since I had just installed kernel 3.9.0-rc2, I tried a suspend and resume
cycle. As expected, it end up frozen (I saw some text from the console,
Xorg/Gnome tried to display something, couldn't, reset, couldn't, reset and
froze). I then rebooted and limited the runlevel to 2 (no Xorg in the way).
>From the command line, I launched a pm-suspend. Once I woke up my computer,
everything was responsive as expected. Does it help in anyway?

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