Comment 48 for bug 195982

Also a non-ubuntu user, but maybe it will help.

Debian Etch AMD64, fully patched; 2.6.18-5-amd64 #1 SMP Sat Dec 22 20:43:59 UTC 2007 x86_64 GNU/Linux

ATI Video drivers

Xorg:
X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Date: 24 January 2008

relevant xorg.conf:
Section "InputDevice"
        Identifier "Generic Keyboard"
        Driver "kbd"
        Option "CoreKeyboard"
        Option "XkbRules" "xorg"
        Option "XkbModel" "pc104"
        Option "XkbLayout" "us"
EndSection

VMware Server Beta 2 Build 84186; *always* running so I can have both Linux & Win desktops available. This never happened using the previous (now expired/unusable) VMware beta; however, other software has been updated since then so I can't isolate it to VMware.

Machine is left on most of the time (since suspend-to-disk doesn't work - different bug *sigh*), error has only happened a few times. My system does *not* become unstable. In the "real" machine, I lose Control, Shift, Caps Lock, but they all work inside the WinXP VM. I found this thread and did setxkbmap, which took care of the problem.