[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 #31 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
Here are the videos. Sorry, they were recorded with my iPod and they are
inverted.

Normal boot sequence before the culprit commit (kernel 3.6)
http://www.filedropper.com/k36
A normal boot sequence with kernel 3.6 from grub 2 to booting console.
Resolution is kept from grub to console, there is no sync problem and no purple
flicker.

A problematic boot with kernel 3.7-rc5 using gfxpayload=keep in Grub 2.
http://www.filedropper.com/k37keep
It starts normally, the booting console uses the same resolution as Grub 2.
However, possibly when radeon driver kicks in, there is a purple flicker
followed by a wrong (badly synced) display (shifted by about half a screen to
the right). The result could have been a black screen, a couple of interlaced
vertical lines or a different shifted display.

A non problematic boot with kernel 3.7-rc5 using gfxpayload=text in Grub 2.
http://www.filedropper.com/k37text
It doesn't show the purple flicker we see in the previous video, it just
flickers as a normal boot would do, but it does show the purple color from time
to time. However, the display is OK.

A problematic suspend/resume sequence with 3.7-rc5 (gfxpayload doesn't change
anything)
http://www.filedropper.com/k37suspend
Going in suspend mode just after booting up. When resuming, X/gdm briefly
appears, then it crashes. The computer continue to run, but the display stays
black and no input can be used (tried to switch console and reboot but it
doesn't work). Often, it will reboot by itself after some time. Suspend and
resume work great before the culprit commit or if I remove the changes in
"...mc_stop()"

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