[Bug 27816] DVI corrupted output on dual setup VGA + DVI

Sat Apr 24 09:34:51 PDT 2010

https://bugs.freedesktop.org/show_bug.cgi?id=27816

--- Comment #10 from untitled.no4 at gmail.com 2010-04-24 09:34:51 PDT ---
(In reply to comment #9)
> There are only two display controllers so you can only have two independent
> sets of timing.  If you have 3 monitors attached, you can only use two of them.
>  The encoder driving the 3rd monitor is probably not properly disabled so it's
> getting timing from whatever crtc was last sourced to it.  Can you identify
> which versions (kernel version, xf86-video-ati version) are working and which
> versions are problematic?  Or better you can you use git to bisect the
> problematic commit?

I spoke too soon... trying with fresh install of Lucid RC showed that sometimes
the DVI screen will work correctly, but it's a matter of luck and most time it
won't.

I'm not trying to have three monitors, just realised that that enabling and
then disabling the LCD fixes the issue. The LCD should be disabled when two
external screens are attached anyway.

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