I have the same issue on my EEE PC 1000. Found a similar bug: Bug #26175.
/var/logs/auth.log shows: Dec 15 14:03:29 zarah-laptop unix_chkpwd[7282]: check pass; user unknown Dec 15 14:03:29 zarah-laptop unix_chkpwd[7282]: password check failed for user (zarah) Dec 15 14:03:29 zarah-laptop gnome-screensaver-dialog: pam_unix(gnome-screensaver:auth): authentication failure; logname= uid=1000 euid=1000 t$
# /var/log$ ls -l /etc/shadow -rw-r----- 1 root shadow 966 2008-12-14 13:56 /etc/shadow
# uname -a Linux mycomputer 2.6.24-21-eeepc #1 SMP Thu Aug 7 22:18:05 MDT 2008 i686 GNU/Linux
I have the same issue on my EEE PC 1000. Found a similar bug: Bug #26175.
/var/logs/auth.log shows: er-dialog: pam_unix( gnome-screensav er:auth) : authentication failure; logname= uid=1000 euid=1000 t$
Dec 15 14:03:29 zarah-laptop unix_chkpwd[7282]: check pass; user unknown
Dec 15 14:03:29 zarah-laptop unix_chkpwd[7282]: password check failed for user (zarah)
Dec 15 14:03:29 zarah-laptop gnome-screensav
# /var/log$ ls -l /etc/shadow
-rw-r----- 1 root shadow 966 2008-12-14 13:56 /etc/shadow
# uname -a
Linux mycomputer 2.6.24-21-eeepc #1 SMP Thu Aug 7 22:18:05 MDT 2008 i686 GNU/Linux