Exposing monitor layout to desktop managers

[Thomas Hellstrom]

Hi!

I'd like to have a standard / generic way of exposing virtual monitor
layout to desktop managers. This would then serve as a *hint* to those
managers to set the desktop up accordingly.

Of course, this is mostly for virtual hardware, since without
accelerometers, gyros and gps positioners on monitors, the kernel
wouldn't be able to know where the user put his monitors.

One could argue that this is purely user-space policy, but since those
managers monitor the kms interface anyway it would be a convenient place
to expose this information.

One idea would to place the x,y location in an output property.

Another idea would be to send new layout for all connected output as a
drm event.

Any ideas, comments etc. would be appreciated.

Thanks,
Thomas