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

[Benjamin Herrenschmidt]

On Thu, 2006-10-26 at 19:25 +0100, Roger Leigh wrote:
> Benjamin Herrenschmidt <benh at kernel.crashing.org> writes:
> 
> >> 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 ?
> 
> Yes, the display just powers off on startup (this is with PanelSize
> and MonitorLayout commented out).

ANd with NoDDC ?

Ben.