http://bugs.winehq.org/show_bug.cgi?id=26410
--- Comment #5 from Michal Suchanek hramrach@gmail.com 2011-10-04 14:18:10 CDT --- AFAICT the current behaviour is exactly the same as above.
Anyway, setting gamma on the crtc is generally wrong, it should be set on the window.
Failing that you *can* figure out which crtc to set because both window and crtc areas are available in screen coordinates.