I can add that this happens because of GNOME also, not jsut X.org. If i
set alt-shift in xorg.conf for layout change, and for ctrl-shift in
gnome, the ctrl-shift-u or ctrl-shift-s etc. shortcuts DO NOT work.
It just changes the layout. So it's not X.org.
--
Keyboard layout change on hotkeys
Made some search, and figured out that it's because of the gnome-
keyring-manager. The same problem
http://groups.google.com/group/linux.debian.bugs.dist/browse_thread/thread/150d601e274584e8/8982eb1a03d596ed
** Changed in: gnome-keyring-manager (Ubuntu)
Sourcepackagename: openssh =