I confirmed thar change in the xorg.conf UseEvents to false, solve problem...
problem not occurs in other distros? i had the same problem in mandriva also.
despite, the GFORCE series 8 works great with 185 drivers, and now, due this problem , Fabio masked the drivers series 190.42!
ALBERTO FEDERMAN NETO
Favorite Distros: Sabayon, Gentoo, Mageia and OpenSUSE