The regular screensaver-power management program
should work on all PCL's, haven't heard before where it didn't.
I turned off the screensaver on my LXDE because I just wanted
to turn on-off the screen at will, like when doing backups, watching
movies, or just sitting around.
xset dpms 0 0 0
The above leaves the screen on
xset dpms 0 0 10
The above turns the screen completely off after 10 seconds
Putting those commands in a desktop icon, a panel icon, or as I do
in an openbox menu selection (in LXDE) puts me in complete control
over the screen when I know it will not be in use for an extended time.
I create two files with those commands in /usr/share/applications and
they will run when selected from the menu, or if the files are placed in
the Desktop, or if I configure them to just appear in the panel.
Why your normal screensaver/power-management isn't working