[qp9013625]

but also intel only when xf86-video-intel is in place, which is replaced by all major distributions with modesetting anways - just two days ago Fedora made the switch.

You are obviously wrong... I am running xf86-video-modesetting and still can adjust "Broadcast RGB" via xrandr.

Of course it's also relevant for xf86-video-modesetting. The xf86-video-* drivers are just the DDX drivers.

Of course xf86-video-modesetting still uses the Intel kernel driver, so "xrandr --output OUTPUT --set "Broadcast RGB" "Full/Limited 16:235/Automatic" still works.

"Broadcast RGB" has nothing to do with the DDX.