Can you try "slock & sleep 1; xset dpms force off"
Also try "sh -x /usr/bin/xflock4" and see if the xset line is actually being executed. It won't be if you have xscreensaver, light-locker or gnome-screensaver installed.
Can you try "slock & sleep 1; xset dpms force off"
Also try "sh -x /usr/bin/xflock4" and see if the xset line is actually being executed. It won't be if you have xscreensaver, light-locker or gnome-screensaver installed.