Re: Ubuntu 9.04 2.6.28-16-generic has black flickers and texture corruption with GTX
update the driver.
i've been using a GTX260 for months and had no real issues other than it getting "pissy" after being run for a long time, 2ish months seems to be the point where i need to log out and log back in to regain performance. Sometimes shorter depending on work load, VMs and eve online seem to be the apps that push up the logout/login time.
i also use jaunty, which i assume you do given the kernel versions you mentioned. I do keep the driver up to date though.