I have a similar problem, but with an ATI RV516 XT Radeon X1600 Series (not Mobility). The problem is that the screen becomes black for about 1 second each "n" seconds. I think "n" is smaller when the windows are bigger.
I noticed that problem with IRC software like xchat and kvirc, but also with the browser firefox in jaunty and in karmic. Also the speed of applications seems affected. I was not so patient to wait until the system becomes too slow to see what it happened after, but I got all this without running compiz nor other visual effects. Yours faithfully, Ab3L -- [X1600] jaunty: X session (radeon) slows down, crashes https://bugs.launchpad.net/bugs/373434 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs