randr 1.2: Primary Output for Laptop + external Screen

Keith Packard keithp at keithp.com
Mon Aug 27 12:49:21 PDT 2007

On Mon, 2007-08-27 at 21:31 +0200, Andreas Schildbach wrote:
> Hi everyone,
> I'd like to hear your opinion on the desired behavior of the video 
> drivers in typical laptop situations with an internal display and an 
> external screen attached (extending the desktop).
> Currently for example the intel driver uses the external screen as the 
> primary output. It is listed first with xrandr. I'm not sure if this is 
> intentional or just coincidence.

It's coincidence -- the laptop hardware has two crtcs, and the LVDS can
only be driven by the second.

Note that RandR doesn't really want the order to be significant; it
would be better if the desktop environment knew about outputs and could
refer to a specific output as 'primary' or 'holds toolbar' or whatever.

keith.packard at intel.com
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