I have the same problem: Fresh install of 12.04 x64, Nvidia 304.37 driver.
I didn't have this problem in 10.04; actually I would say it's started in the last few months but I can't put an exact date on it.
I have the same problem: Fresh install of 12.04 x64, Nvidia 304.37 driver.
I didn't have this problem in 10.04; actually I would say it's started in the last few months but I can't put an exact date on it.