Please Install the Updated Packages.
This update corrects two issues with the evdev driver Xorg. The first is that button events were not generated for mice with more than seven buttons (bug #39014) the second is that the pointer did not cross screens using the evdev driver. This update corrects both issues.
x11-driver-input-evdev on Mandriva Linux 2008.1, Mandriva Linux 2008.1/X86_64