[patch] XVideo on my Radeon

Benjamin Herrenschmidt benh at kernel.crashing.org
Wed Jan 25 17:35:43 PST 2006

> IIRC, note that these cards don't even have two dacs (and there is no 
> notion of that in the driver code, only tvdac and primary dac), hence 
> the DVI-D connector. 

Hrm... all cards have 2 DACs unless they are really old r100/rv100
afaik ...

> This is a special "feature" of the r200 chip, it 
> can drive two displays but only has one internal dac. Some cards with 
> that chip though feature an external dac, like the original ati cards 
> (though I believe there were also cards available with a dvi-i connector 
> but not carrying analog signals...), but especially 8500le and 9100 
> cards not always do. This may explain the weird looking table. I think 
> for tv-out those cards always used the rage theatre chip, thus they 
> could still use twin-view with crt + tv out.

Hrm... are you sure ? I though they all had a TV DAC (secondary DAC)
(and additionally all rv chips and post r200 chips have an internal ERT
TV encoder too).


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