I have one PC where I have my main screen using 1024x768 resolution and my another screen using 1980x720 resolution.
But why its so slow, is there any way to make it faster like normal?
I had the same issue with Fedora 15 like now I have with Ubuntu.
Follow up:
$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
$ export DISPLAY=:0.0 && glxinfo | grep -i direct
direct rendering: Yes