The keyboard suffers from atrocious key bounce, as you will probably have noticed by the time you get this far.
Use "AccessX" to define the bounce delay:
1. Obtain the tarball and follow the installation instructions given at:
http://www.rehab.uiuc.edu/accessx/freewareaccessx.html
2. Add the following lines to /etc/X11/xdm/Xsession after the section where it runs all the system xinitrc shell scripts:
# inserted to prevent key bounce
ax +bouncekeys
ax -timeout
ax bouncedelay 5
# end inserted lines
(This is for RedHat 8.0: other distros may be different, but essentially you need to find a file from which scripts are run every time the X-server starts up).
In file /etc/X11/XF86Config, set the Xkbdisable function as follows:
# To disable the XKEYBOARD extension, uncomment XkbDisable. Option "XkbDisable"
This works more reliably than Method 1, but you will lose some keyboard functionality, specifically anything invoked by the AltGr key.