Display Power Management Signaling
DPMS (Display Power Management Signaling) is a technology that allows power saving behaviour of monitors when the computer is not in use.
- 1 Setting up DPMS in X
- 2 DPMS Interaction using xset
- 3 DPMS Interaction in a console with setterm
- 4 External Resources
Setting up DPMS in X
Add the following to your
/etc/X11/xorg.conf in the
Option "DPMS" "true"
Add the following to the
ServerLayout section, change the times (in minutes) as necessary:
Option "StandbyTime" "10" Option "SuspendTime" "20" Option "OffTime" "30"
Note: If the "OffTime" option does not work replace it with the following, (change the "blanktime" to "0" to disable screen blanking)
Option "BlankTime" "30"
DPMS Interaction using xset
It is possible to turn off your monitor using the
xset dpms force standby
puts the screen(s) into standby,
xset dpms force suspend
makes them to suspend and
xset dpms force off
turns them off immediately. If you leave your computer, you don't need to wait for the timeout you set that the display turns off. Simply enfoce it by using the xset command.
Note that you may need to prefix the command with
sleep 1; for it to work correctly. For example,
sleep 1; xset dpms force off
You could also copy this script: Template:File
Make it executable (chmod u+x /usr/local/bin/display.sh) and just run display.sh off. For the latter to work you need to include /usr/local/bin into your path, otherwise you have to execute it with the whole path:
# With /usr/local/bin in your PATH display.sh suspend # Without /usr/local/bin in your PATH /usr/local/bin/display.sh standby
Disable DPMS and prevent screen from turning off (thanks damir)
Useful when watching movies or slideshows:
The first command turns off DPMS
This one disables screen saver blanking:
xset s off
DPMS Interaction in a console with setterm
The setterm utility issues terminal recognized escape codes to alter the terminal. Essentially it just writes/echos the terminal sequences to the current terminal device, whether that be in screen, a remote ssh terminal, console mode, serial consoles, etc.
Prevent screen from turning off (in console)
$ setterm -blank 0 -powerdown 0
Pipe the output to a cat to see the escapes
Pipe the escapes to any tty (with write/append perms) to modify that terminal
Note the use of >> instead of >. For permission issues using sudo in a script or something, you can use the tee program to append the output of setterm to the tty device, which tty's let appending sometimes but not writing. Template:Cli