Comment 11 for bug 794315

This bug was fixed in the /etc/lightdm/Xsession script, which is part of the Debian/Ubuntu packaging, not upstream:
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/oneiric/lightdm/oneiric/revision/10

So I think this will need to be dealt with on the Gentoo side, and there’s nothing to reopen from here.