I see this is a fresh install; is this a new system or have you had linux or other things installed on it previously? If so, did you notice the black blinks then too? Had you been running natty prior to this install, and did you see it then?
** Package changed: xorg (Ubuntu) => xserver-xorg-video-ati (Ubuntu) ** Changed in: xserver-xorg-video-ati (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/727979 Title: Screen flicker approx. every 30 seconds -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs