ATI driver, gamma settings are lost when you reboot the operating system (Ubuntu 12.04)

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http://askubuntu.com – I'm using proprietary driver ATI (FGLRX). My problem is that after restarting system all settings which I did in Catalyst Control Center does not apply, though displayed correctly (eg gamma set to 0.75, and if I click on the arrow up or down, along with the value settings once applied correctly) When I restart the system settings are gamma 1.0, although I put them on 0.75. In LightDM I saw that the screen becomes darker, then it becomes too bright. Sorry, for my english (HowTos)