ATI has made a change in their fglrx catalyst drivers (9.5+) where setting the gamma in xorg.conf no longer works and is ignored when starting.
In my previous post I went over setting and making these adjustments. The previous methods for Contrast and Brightness remain. However for gamma, the only way and previously existing method is now using fglrx_xgamma.
In terminal;
fglrx_xgamma -c 0 -gamma .85
This setting will be immediately applied and also after restarting.
[...] Use fglrx_xgamma for setting gamma. Xorg.conf gamma no longer works in fglrx versions 9.5 and [...]