[Bug 27692] Evergreen and triple head segfaults xorg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27692

--- Comment #7 from Dave Airlie <airlied at freedesktop.org> 2010-04-17 19:20:04 PDT ---
(In reply to comment #6)
> Hi Alex,
> 
> Xorg doesn't segfault anymore. The fix looks very simple. Has anybody used more
> than two screens with evergreen before? 
> 
> Now the card drives all screens (2xDVI + HDMI), but one has the same wrong
> colors as I've seen without Xorg, which makes sense because of KMS. You pointed
> out that I'll need a DP screen. Is it really necessary? Because the mouse
> pointer is correctly drawn on every screen. Dmesg points out that the DP and
> HDMI port share the same UNIPHY. Afaik it is possible to connect HDMI to DP and
> DP will create a HDMI signal. Probably the HDMI port of this card is already
> connected to the DP and I don't need a DP screen. If not, pls proof me wrong.
> The broken screen is connected via DVI and it's the third connected screen. 
> 
> Now either the third screen should be deactivated because it is not possible to
> drive it correctly or there's another bug if you connect more than two screens.
> This leads back to my first question.

It either has to be DP or use an *active* DP convertor. i.e. not a DP->DVI or
DP->HDMI.

The thing is there are only 3 clocks, and one clock drives only DP frequencies
from what I know.

I'm not sure if the 3rd clock can be persuaded to run at non DP rates.

Dave.

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