[Bug 56139] [bisected] kernel 3.7.0-rc1 breaks 6950 (CAYMAN)

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Comment # 22 on bug 56139 from
(In reply to comment #21)
> (In reply to comment #19)
> > If I followed you correctly, setting bit 24 to "1" disables memory but keeps
> > the CRTC state as it is (hopefully in sync with the monitor). However, what
> > I see when grub2 kicks in with the "gfxpayload=keep" is an unsynced monitor.
> > Sometimes the display will be black, other times it will only appear in the
> > first couple of vertical lines, in others it will be vertically synced but
> > shifted to the right at half or at two third of the screen. In other words,
> > this really seems to be a sync problem. Should I try to combine patch 69113
> > and patch 69370 with the others?
> 
> Are you saying the monitor gets messed up when grub kicks in?  I.e., before
> the OS loads?  If so, that sounds like a grub issue.

I'll take some pictures or record a small video of what's going on. That will
be easier to understand. But yes, I'm beginning to think Grub2 is playing a bad
trick somewhere in there and is not playing nicely when handling the
framebuffer.


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