Добрый вечер. Вот лог xscreensaver'a: http://pastebin.com/pgWxQ6fY
/etc/pam.d/xscreensaver:
#
# /etc/pam.d/xscreensaver - PAM behavior for xscreensaver
#
@include common-auth
@include common-account
При попытке ввода пароля пишет authentication failed
