Update on RandR changes from DDC

[Ian Romanick]

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Keith Packard wrote:
> 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.

Is that really correct?  I could have sworn that splitter cables were
available for dual-link DVI connects that allowed them to drive two
monitors.  That also doesn't cover the case of crazy displays like the
IBM T221 that require two dual-link DVI connections to drive properly.
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