On Saturday 03 Sep 2011 04:15:32 meino.cramer@gmx.de wrote:
> Hi,
> 
> in my xorg.conf I have set this:
> 
> 
>     Section "InputClass"
>         Identifier "keyboard-all"
>         Driver "evdev"
>         # Option "XkbOptions" 
> "ctrl:nocaps,compose:ralt,terminate:ctrl_alt_bksp" Option "XkbOptions"
> "terminate:ctrl_alt_bksp,caps:super"
>         MatchIsKeyboard "on"
>     EndSection

Does:

    Option "XkbOptions"  "terminate:ctrl_alt_bksp"

on its own work?

On one box of mine I had to add:

       MatchDevicePath "/dev/input/event*"


Also, check that you have not any old conflicting directives in Section 
"ServerLayout", like e.g. InputDevice    "Keyboard0" "CoreKeyboard"

-- 
Regards,
Mick