[patch] XVideo on my Radeon

Alex Deucher alexdeucher at gmail.com
Wed Jan 25 17:41:58 PST 2006

On 1/25/06, Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote:
> > 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).

No Roland's right.  R200 had only one integrated DAC.


> Ben.

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