Gamma adjustment doesn't work

[Bucic]

The configuration files are in ~/.frictionalgames (~ == home). the ones in steamapps are the defaults that get copied by the game to ~/.frictionalgames

On a side now the Gamma IS Broke, and it's due to your window manager.. Switch to a non-compositing window manager and gamma will work fine. This is especially true of Compiz. Essentially we have to rewrite the entire gamma system to work differently to work around this annoyance.

It's confusing for me because there are:
/home/<username>/.frictionalgames/Amnesia/Main/<ingameusername>/user_settings.cfg
and
/home/<username>/.frictionalgames/Amnesia/Main/main_settings.cfg

The note on window managers:
This is weird because gamma adj. works in Amnesia under GNOME 3.6 and now it doesn't work for me in LXDE.