This happens to me every few days too. I'm on Ubuntu Lucid 64bit with a Geforce 8400 GS with recommended proprietary drivers running two monitors. My keyboard inputs do not respond when this freeze happens. I tried the 'RightOf' change as suggested in a few comments but upon continuation of crashes I restored the old config.
This happens to me every few days too. I'm on Ubuntu Lucid 64bit with a Geforce 8400 GS with recommended proprietary drivers running two monitors. My keyboard inputs do not respond when this freeze happens. I tried the 'RightOf' change as suggested in a few comments but upon continuation of crashes I restored the old config.