I also have the same problem on my HP Compaq 6715b with Jaunty AMD64. Screen flickers very often. I already deactivated compiz. It got a little better, but not much.
I uninstalled fglrx following the instructions https://wiki.ubuntu.com/X/Troubleshooting/FglrxInteferesWithRadeonDriver but it didn't help
I also have the same problem on my HP Compaq 6715b with Jaunty AMD64.
Screen flickers very often.
I already deactivated compiz. It got a little better, but not much.
I uninstalled fglrx following the instructions https:/ /wiki.ubuntu. com/X/Troublesh ooting/ FglrxInteferesW ithRadeonDriver but it didn't help