Ubuntu 8.04 + nVidia 8800GT
It worked great until I upgraded the system yesterday, I did not see what exactly I upgraded, but glanced there was Compiz there.

When the upgrade finished I restarted the computer the resolution went back to the lowest. I checked the restricted hardware, my nVidia card is checked, said in use. However, I went to my nvidia card manager (forgot its name) and it said the card drive is not used to the xserver. I tried to remove the drive, and reinstalled, but still didn't work.

Could anyone help me with it?