I'm don't know about the relationship with xmodmap -- I thought that was superseded by XKB, but I may be wrong. In any case, mod4 not working properly in Gnome is a well-known bug, or has been so for at least a year; perhaps what you're seeing is an instance of it. See the following:
https://launchpad.net/distros/ubuntu/+source/control-center/+bug/16815 http://bugzilla.gnome.org/show_bug.cgi?id=165343 Metacity bindings work properly, but g-s-d ones don't. Which bindings are handled by which depends. You can use gconf-editor to bind keys to commands through metacity, as described e.g. at http://linuxformat.co.uk/wiki/index.php/Setting_Key_Bindings_in_GNOME I got bindings to work (in Edgy) by setting win-key to be Hyper and binding keys such as "<Hyper>s" using gconf-editor as described above. -- GNOME keybindings register as <Mod4><Hyper>L (and do not work) https://launchpad.net/bugs/55729 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs