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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [bisected] kernel 3.7.0-rc1 breaks 6950 (boot/grub2 and suspend/resume) (CAYMAN)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=56139#c51">Comment # 51</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [bisected] kernel 3.7.0-rc1 breaks 6950 (boot/grub2 and suspend/resume) (CAYMAN)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=56139">bug 56139</a>
from <span class="vcard"><a class="email" href="mailto:alexandre.f.demers@gmail.com" title="Alexandre Demers <alexandre.f.demers@gmail.com>"> <span class="fn">Alexandre Demers</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=56139#c50">comment #50</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=56139#c49">comment #49</a>)
> > 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.</span >
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?</pre>
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