https://bugs.winehq.org/show_bug.cgi?id=54593
--- Comment #2 from François Gouget fgouget@codeweavers.com --- The post below posits that the restrictions on the gamma range changes are meant to prevent malicious programs from inverting colors, blank the display, or make two colors identical (to hide text), etc. It also says the restrictions are undocumented but has no indication on when they were introduced.
http://jonls.dk/2010/09/windows-gamma-adjustments/