Comment 1 for bug 681162

Hi, thank you for reporting this issue!
This behavior was witnessed on several test machines,
so I'm able to confirm this. However a more elegant
solution to this would be to use the Linux Mint
Adjustments System as opposed to maintaining
GDM3 itself.

This and other "default setup" issues will be
resolved in a future release. Thank you for
taking the time to report this issue and improve
the Linux Mint project !