Combining Ctrl + Super_l + ' (quote) does not work

[Yarek Kowalik]

I'm running GNU Emacs 22.1.1 (x86_64-pc-linux-gnu, X toolkit, Xaw3d
scroll bars) of 2008-05-02 on king, modified by Ubuntu

I have some commands bound to C-s-'.  It fails with the right side key
combination, but on the left. That is, it works when I press Ctrl_r +
Super_r + ', and not but when I press Ctrl_l + Super_l + '.  Ctrl_l +
' is recognized as C+' and Super_l + ' is recognized as s-', but
strangely combining Ctrl_l and Super_L does not produce C-s-.

It's a command I use often, and this is highly annoying as it works
fine on my x86 laptop where I run GNU Emacs 22.1.1 (i486-pc-linux-gnu,
X toolkit, Xaw3d scroll bars) of 2008-05-03 on terranova, modified by
Ubuntu.

Any clue where I need to tweak to make this work?

Yarek