Comment 21 for bug 996791

I created a package lightdm using the patch of metux (weigelt). It works for me too.

Download it here: (Installing lightdm_1.2.1-0ubuntu3_amd64.deb is enough).
https://launchpad.net/~andreas-diesner/+archive/lightdm-fix-temporary

The next official lightdm package will overwrite the patch again, so you should be save.