[Bug 56359] [GM965/GL960] external monitor flickering with red stripes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56359

--- Comment #15 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #14)
> Not sure, but are we really doing VGA over SDVO here or could it be ADPA? If
> so, ADPA is bound to the wrong pipe when the problem occurs and thus never
> turns HSYNC or VSYNC off.

There should be special bits for the VGA dpms state to turn of h/vsync. See
intel_crt_set_dpms

> I have no idea why the pipe changes yet but it wouldn't hurt setting it
> again in intel_crt_set_dpms(). Would you like a patch for this or am I way
> off?

As long as ADPA is disabled, we should be fine (bit31) and the selected pipe
(bit30) shouldn't affect anything ...

I'm still confused what's going on here.

The SDVO issue was a red herring, it doesn't look like it's used on your
system.

Another thing to try is to enable debug output with drm.debug=0xe and then grab
a dmesg both when the mode switching works and when it doesn't. I suspect
something in the exact ordering is slightly different, which then brings up a
bug somewhere.

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