辞不达意

My favorite screensaver is "nose man" from href="http://www.tux.org/~bagleyd/xlockmore.html">xlockmore, but
gnome screensaver seems no way to use it. I don't want to spend time
to hack gnome-screensaver's configuration, instead, I found this
alternative screen lock program - xautolock. Xautolock can lock the
screen use any lock program, so it's possible to invoke xlockmore's
binary "xlock" with whatever mode you like.

Xautolock also has a cool feature, it can lock the screen when the
mouse is over a screen corner with a customized delay.

To install:

$ sudo apt-get install xlockmore xautolock

Here are the arguments to call xautolock, logged here to prevent read
the long man page again.

# replace gnome-screensaver, lock screen if idle for 5 minutes, or
# mouse over a corner for 3 seconds
#
msg="All money go my home :-)"
/usr/bin/xautolock \
    -corners ++++ -cornerdelay 3 -cornerredelay 30 \
    -time 5 -locker "/usr/bin/xlock -mode nose -message '$msg'" &

Put this to /etc/rc.local (for ubuntu), it will be
executed by /etc/rc2.d/S99rc.local on boot up.Since it's an X11 program, it could be started only after a user logged in
to X. To start it automatically for gnome X manager, use session manager
tool to add an entry is a handy way, "System" -> "Preference" ->
"Sessions".

Also, you can create a shortcut point to command xautolock
-locknow to lock the screen immediately.

Goodbye, gnome-screensaver.

$ killall gnome-screensaver
$ sudo apt-get remove gnome-screensaver