I am using ltsp-4.2 on terminasl together with KDE. I found, there is not
working cz_qwerty keyboard layout in the LTSP 4.2 version.
When I have added layout definition from older version, keyboard works fine.
[root@turing /opt/ltsp-4.2/i386/etc/X11/xkb/symbols/pc] 17:48:12
# cp -av /opt/ltsp/i386/etc/X11/xkb/symbols/pc/cz_qwerty ./
`/opt/ltsp/i386/etc/X11/xkb/symbols/pc/cz_qwerty' -> `./cz_qwerty'
Do you still experience this issue with newer drivers ?
Please check the status of your issue.