The modifier is not recognized and it can't be used in combinations with other keys under KDE (maybe others). The problem is discussed on the KDE Buglist (somewhere after the mouse problems): http://bugs.kde.org/show_bug.cgi?id=78467 The patch is also linked there: http://bugs.kde.org/attachment.cgi?id=5740&action=view Is is reported for XFree4.4.0 but I seem to have the same problem for X.org (test2 build from ArchLinux - http://www.archlinux.org). I haven't compiled xkb with that patch to see that it works also on X.org.
*** This bug has been marked as a duplicate of 587 ***
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