Bug#389007: [Xorg-driver-ati] Bug#389007: Regression: Radeon 9200 powers off Apple Cinema Display connected via DVI

[Benjamin Herrenschmidt]

> I found a solution to the problem.  Adding
> 
>         Option "PanelSize" "1680x1050"
>         Option "MonitorLayout" "TMDS,NONE"
> 
> made the display work correctly.  IIRC this was needed with XOrg 6.9,
> but wasn't needed with 7.0 (because it was intelligent enough to
> autodetect correctly?).  This seems to be a regression in 7.1.
> 
> Both the PanelSize and MonitorLayout need to be exactly as above.  If
> either is commented out, or I change MonitorLayout to just "TMDS", the
> monitor powers off.
> 
> 
> Just in case it's affecting anything, I'm adding
> 
>   append="video=radeonfb:1680x1050-32 at 60"
> 
> in my yaboot.conf in order to get a fullscreen framebuffer.

radeonfb shouldn't need that ...

What if, instead, you use Option "ReverseDDC" "true" btw ? Same
symptoms ?

Ben.