[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 #37 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #36)
> (In reply to comment #33)
> > > Here is a partial kernel.log tracking what is going on at boot with some
> > > debug printk in evergreen_mc_stop() and evergreen_mc_resume(). Strangely,
> > > only one crtc is saved as enabled in the _stop function, but four are
> > > restored in the _resume function. Pretty sure it's not the problem we are
> > > looking for, but it is abnormal since only one crtc should be restored on
> > > resume. This is a bug by itself showing a problem in the
> > > save(stop)/restore(resume) mechanism.
> > 
> > I should have said "... but six are restored..." instead of "... but four
> > are restored..." I also made a small error in a debug string, but it doesn't
> > change the read value. If you have any question on my patch, let me know.
> 
> That issue is fixed in attachment 69573 [details] [review] which is already
> upstream.

I know it should have been fixed and that's why I added a printk(KERN_INFO
"Restoring crtc[%d] since it was enabled.\n", i) just after it to check it. For
some reason it seems to not be working properly. Have a look at my patch
(attachment 70233) which was written on a 3.7.0-rc6 kernel. I'll add some other
printk when I'll get home (like a printk just before this check to output its
value).

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