I had this problem in Xubuntu 6.06 LTS (XFCE) on an old AMD K6-2/500 with SiS 530/5595 chipset. Very difficult to login at the login window.
Add the kernel parameter 'clock=tsc' in GRUB (ie: to the 'kernel' line of the top kernel entry in /boot/grub/menu.lst).
I had this problem in Xubuntu 6.06 LTS (XFCE) on an old AMD K6-2/500 with SiS 530/5595 chipset. Very difficult to login at the login window.
Add the kernel parameter 'clock=tsc' in GRUB (ie: to the 'kernel' line of the top kernel entry in /boot/grub/ menu.lst) .