Hello, I would like to use Gammapage to set the Gamma of my screen but when I change the gamma on the software it doesn't do any thing.

driver : AMD Catalyst 7.11
card; ATI Radeon 9550
OS: Ubuntu 7.10
Gammapage: 0.5
screen: ACL connecting by DVI

An other question:
can I set contrat and brightness on xorg.conf?

Tank you to help me,
Pier Luc