" Is there any way to change them. "
Yes. You can probably fix the problem by editing /etc/X11/XF86Config. Most distributions provide a command line utility to edit the settings in /etc/X11/XF86Config. Please post your distribution name and somebody who uses that distribution can tell you the name of the command to use.
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Be prepared. Create a LifeBoat CD.
http://users.rcn.com/srstites/LifeBo...home.page.html
Steve Stites