[RFC] Randr 1.3 feature - get property

[Jesse Barnes]

Right now, the Randr core code will just return the current (cached) property 
value when a get property request comes in.  This is fine in many cases, but 
fails in others, for example when fetching backlight brightness after some 
other agent has changed its value.

This patch adds the core server code to call back to a driver's get_property 
routine, which should update the property, which the Randr core will then 
return.

I haven't implemented the i830_lvds.c portion of this, but it should be 
trivial.

Any thoughts?  Am I on the right track here?

There are still several 1.3 features I haven't seen patches for yet:
  - dpms events (notify clients of dpms changes)
  - per-output dpms controls
  - panning rectangle
  - client hotplug notification (or is that already possible?)

Thanks,
Jesse
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