In Windows 7 as well as Vista. Compensating via CCC's Gamma/brightness/contrast helps a little but doesn't really fix it.
And no, it has nothing to do with avivo colour, as it happens on desktop (2D) from moment 9.11 is installed. Cat 9.10 and Catalyst Hotfix for Dirt2 (8.673.1) didn't have this problem, only 9.11.
Btw, EDID option seems to be gone? My monitors are correctly detected though, and all their supported resolutions/refresh rates.
Catalyst 9.11 suffers from:
corrupt display brightness, compensating by CCC desktop properties > Gamma/brightness/contrast helps a little.