When I have my PBG3 in clamshell mode (woke up with internal monitor off) using an external TFT and I press "Identify" in the Monitors panel, the INTERNAL TFT is flickering and starting ON again (as main screen)!
This can't be a feature, can it? E.g. won't use the set background (external does).
That's on 10.3.9.
PB.