@hadeutscher thanks - from what we can tell, this hardware simply has no support for color controls for external displays. You have found our workaround, which is to look for "two displays active" and turn on our GPU/fallback mode.

We still have to see if the "clamshell" mode is as easy to detect.

The bad part about this is the adreno drivers still say they fully support color controls, so we cannot detect it the usual way, we had to list the driver name in the app as an exception.