Comment 3 for bug 709551

Same here.

If this happens, you can choose 'switch user' and then login again using the normal GDM login screen. So it is the screen saver dialog that does not recognise the password. auth.log says:

May 6 11:27:43 lord-jim unix_chkpwd[8053]: check pass; user unknown
May 6 11:27:44 lord-jim unix_chkpwd[8055]: check pass; user unknown
May 6 11:27:44 lord-jim unix_chkpwd[8055]: password check failed for user (maarten)
May 6 11:27:44 lord-jim gnome-screensaver-dialog: pam_unix(gnome-screensaver:auth): authentication failure; logname= uid=1000 euid=1000 tty=:0.0 ruser= rhost= user=maarten
...
May 6 11:33:17 lord-jim gdm-session-worker[8300]: pam_succeed_if(gdm:auth): requirement "user ingroup nopasswdlogin" not met by user "maarten"
May 6 11:33:19 lord-jim gdm-session-worker[8300]: pam_unix(gdm:session): session opened for user maarten by (uid=0)
May 6 11:33:19 lord-jim gdm-session-worker[8300]: pam_ck_connector(gdm:session): nox11 mode, ignoring PAM_TTY :1