Comment 2 for bug 299717

/var/logs/auth.log shows:

Dec 12 12:49:18 my-hostname unix_chkpwd[7693]: check pass; user unknown
Dec 12 12:49:18 my-hostname unix_chkpwd[7693]: password check failed for user (my-username)
Dec 12 12:49:18 my-hostname gnome-screensaver-dialog: pam_unix(gnome-screensaver:auth): authentication failure; logname= uid=1000 euid=1000 tty=:0.0 ruser= rhost= user=my-username

repeatedly. Unfortunately there is no entry for the successful authentication via gdm.