I m encountering this problem on bt4 r2 booted via live usb ..apparently not even on when booted via live dvd
when KDE desktop is loaded mouse cursor doesn't move at all.
on startx, i tried "lsusb" ..it shows the mouse there..
"aptitude purge mouseemu" didn't work as well...
but usb keyboard works fine (I know it because when i press "ctrl+alt+del", system goes to reboot..
guys please help...coz i don't want to revert to bt4-final which works well