This works in Ubuntu 12.10 Alpha "Quantal Quetzal".
$ gdm --version
GDM 3.5.90
** Changed in: gdm (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/47549
Thank you for your bug report. The issue is an upstream one and it would
be nice if somebody having it could send the bug the to the people
writting the software (https://wiki.ubuntu.com/Bugs/Upstream/GNOME)
** Changed in: gdm (Ubuntu)
Importance: Undecided => Low
** Changed in: gdm (Ubuntu)
