Update on RandR changes from DDC

Keith Packard keithp at keithp.com
Thu Jul 20 12:18:29 PDT 2006


On Thu, 2006-07-20 at 08:46 -0700, Alan Coopersmith wrote:
> Keith Packard wrote:
> > However, actual hardware has another piece in the middle, the CRTC
> > itself, which is relevant as there may be 0, 1 or 2 monitors connected
> > through each CRTC to the frame buffer.
> 
> Or 1/2 in the case of jumbo sized monitors like the Apple 30" Cinema Display
> which takes two inputs to drive.
> 
> Does the new xrandr design assume there is always a 1-to-N mapping from
> viewport to output or will it allow N-to-1 mappings like this?

In this case, there is one logical CRTC for driving the single output,
and the problem devolves to constraining the possible mode/output
combinations.

-- 
keith.packard at intel.com
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