screen locking - pam and xscreensaver

[Scott Ehrlich]

For an install that utilizes PAM for xscreensaver within both gnome and 
kde, what factors would lead to xscreensaver not being able to properly 
unlock the user?  I reviewed the logs and nothing helped.

I performed ldd on xscreensaver and an ls -l on each dependency proved they 
were all there.

The system uses local /etc/passwd and /etc/shadow files for authentication - no 
NIS or LDAP or Kerberos.

If Xwindows was to be disabled, and only tty was used, what would be the best 
option for ensuring the logged-in session was locked after a determined amount 
of inactivity>

Also, if the user stepped away from the system and wanted to manually lock it, 
what is the best tty screen-locking utility? I reviewed vlock, but after 
prompting me for my password, it then prompted for root's.  That was less than 
helpful.

Thanks.

Scott