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

[Roger Leigh]

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).


Regards,
Roger

-- 
  .''`.  Roger Leigh
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