[randr-1.3] ramdac awareness

Maarten Maathuis madman2003 at gmail.com
Fri Nov 23 02:20:10 PST 2007

Just for the record, when i talk of ramdac i mean output stage, guess
that's a sideeffect of working on only one type of hardware :-)


On 11/23/07, Dave Airlie <airlied at gmail.com> wrote:
> On Nov 23, 2007 7:41 PM, Maarten Maathuis <madman2003 at gmail.com> wrote:
> > But there are outputs which can run on more than one ramdac and those
> > that can't, so static approaches are out of the question.
> >
> > You actually need to occupy ramdac 0, even if the "normal" output on
> > there isn't used. The usual situation is like this:
> >
> > 2 ramdac's, 2 outputs, one can run on the primary ramdac's, the second
> > can run on both ramdac's
> But you should be able to deal with all of that inside the driver, by
> restricting the combos..
> I can't see how exposing the internals of a specific card arch in the
> protocol is going to help..
> A ramdac is just a DAC (analog output), nvidia have registers
> co-located with the RAMDAC control that aren't ramdac registers from
> what I can see, they can be extended crtc timing regs..
> So you need to distinguish on the hw between what is actually a DAC
> output and what is digitial timings etc..
> Dave.

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