Display Power Management Signaling

DPMS (Display Power Management Signaling) enables power saving behaviour of monitors when the computer is not in use. The time of inactivity before the monitor enters into a given saving power level, standby, suspend or off, can be set as described in DPMSSetTimeouts(3). Note that DPMS was developed for CRT monitors, and on LCD displays, there is normally no difference between the standby, suspend and off modes.

Setting up DPMS in X

Note: As of Xorg 1.8 DPMS is auto detected and enabled if ACPI is also enabled at kernel runtime.

Add the following to a file in /etc/X11/xorg.conf.d/ in the Monitor section:

Option "DPMS" "true"

Add the following to the ServerFlags 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, use screen blanking instead, which will keep the monitor turned on with a black image. Alternatively, change "blanktime" to "0" to disable screen blanking

Option         "BlankTime" "30"

An example file /etc/X11/xorg.conf.d/10-monitor.conf could look like this.

Section "Monitor"
    Identifier "LVDS0"
    Option "DPMS" "false"
EndSection

Section "ServerFlags"
    Option "StandbyTime" "0"
    Option "SuspendTime" "0"
    Option "OffTime" "0"
    Option "BlankTime" "0"
EndSection

Section "ServerLayout"
    Identifier "ServerLayout0"
EndSection

Disabling DPMS

Since DPMS is enabled by default in many scenarios, explicit action must be taken to disable it. To completely disable DPMS, add the following to a file in /etc/X11/xorg.conf.d/10-monitor.conf:

Section "Extensions"
    Option      "DPMS" "Disable"
EndSection

Modify DPMS and screensaver settings with a command

It is possible to turn off your monitor with the xset command which is provided by the xorg-xset package.

Examples:

Command	Description
	Disable screen saver blanking
`xset s 3600 3600`	Change blank time to 1 hour
	Turn off DPMS
	Disable DPMS and prevent screen from blanking
	Turn off screen immediately
	Standby screen
`xset dpms force suspend`	Suspend screen

To query the current settings:

See for all available commands.

DPMS interaction in a Linux 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.

setterm Syntax: (0 disables)

$ setterm --blank [0-60|force|poke]
$ setterm --powersave [on|vsync|hsync|powerdown|off]
$ setterm --powerdown [0-60]

Pipe the output to a cat to see the escapes

$ setterm --powerdown 2>&1 | exec cat -v 2>&1 | sed "s/\\^\\[/\\\\033/g"

Pipe the escapes to any tty (with write/append perms) to modify that terminal

$ setterm --powerdown 0 >> /dev/tty3

Bash loop to set ttys 0-256

$ for i in {0..256}; do setterm --powerdown 0 >> /dev/tty$i; done; unset I;