I have another problem with my HD 5770 ATI card.
It's fan all the time runs with the same speed (i think it's about 60% cause i dont know how to measure it on Ubuntu).
I have installed the drivers following this method
Even if i left my computer for three hours alone without any aplication runing, or watching video - every time it has the same speed.
I have dual boot with Windows 7 and there my graphic card fan is slow when i dont use PC and runs quicker if i start videos or games.
How to solve this problem?
I read that i can set fan speed to custom value, for example 30%, but how to make it to control automaticaly by the drivers. Thanks. (Sorry for my english, im not from english speaking country and it's hard for me to speak it)