Comment 9 for bug 21767

Well, after some investigation, here is my resume: it is X problem, not gnome,
not xkeyboard-config.

xkb_keymap {
        xkb_keycodes { include "xfree86+aliases(qwerty)" };
        xkb_types { include "complete" };
        xkb_compat { include "complete" };
        xkb_symbols { include "pc(pc105)+ch+group(alts_toggle)" };
        xkb_geometry { include "pc(pc104)" };
};

Put this stuff into badlayout.xkb, then:

xkbcomp badxkbmap.xkb :0.0

It fails with server-side error. So it is worth fixing on x server side. BTW,
this map successfully compiles to xkm. If you do

xkbcomp badxkbmap.xkb -xkm badxkbmap.xkm

it gives some warnings - but succeeds (and you can even xkbprint the result).

Phillip, could you please reassign it to xserver-xorg or something?

BTW, if instead of alts_toogle one uses rctrl_toggle - it works ok.