If you have two computers and want to share the keyboard and mouse, you should try synergy, it's very cool, you can point to the right of the screen and find that the mouse will travel to the next...

I am having a similar problem in Mdk 10, I have tried modifying the XF86Config-4 file but it doesn't seem to make a difference, I have checked for errors in the dmesg and /var/log/ I can't find any...