Difference between revisions of "Display Power Management Signaling"

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(Modifying DPMS and screensaver settings using xset: Mentioning an extra, possibly better, way of disabling DPMS with xset.)
 
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[[Category:X server]]
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[[Category:Power management]]
 
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[[ja:Display Power Management Signaling]]
 
[[ru:Display Power Management Signaling]]
 
[[ru:Display Power Management Signaling]]
[[zh-CN:Display Power Management Signaling]]
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[[zh-hans:Display Power Management Signaling]]
[[Category:X Server]]
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'''[[Wikipedia:VESA Display Power Management Signaling|DPMS]]''' (Display Power Management Signaling) enables power saving behaviour of monitors when the computer is not in use. For details on each timeout, see [http://linux.die.net/man/3/dpmssettimeouts]. Note that some monitors make no difference between various DPMS modes.
[[Category:Power management]]
 
'''[[Wikipedia:VESA 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.
 
 
 
For details on each Timeout, see the Description section [http://linux.die.net/man/3/dpmssettimeouts here].
 
  
 
== Setting up DPMS in X ==
 
== Setting up DPMS in X ==
Line 19: Line 17:
 
  Option "SuspendTime" "20"
 
  Option "SuspendTime" "20"
 
  Option "OffTime" "30"
 
  Option "OffTime" "30"
{{Note|If the {{ic|"OffTime"}} option does not work replace it with the following, (change the {{ic|"blanktime"}} to {{ic|"0"}} to disable screen blanking)
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{{Note|If the {{ic|"OffTime"}} option does not work, use screen blanking instead, which will keep the monitor turned on with a black image. Alternatively, change {{ic|"blanktime"}} to {{ic|"0"}} to disable screen blanking
 
  Option        "BlankTime" "30"
 
  Option        "BlankTime" "30"
  
Line 33: Line 31:
 
     Option "StandbyTime" "0"
 
     Option "StandbyTime" "0"
 
     Option "SuspendTime" "0"
 
     Option "SuspendTime" "0"
     Option "OffTime" "0"
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     Option "OffTime"     "0"
 +
    Option "BlankTime"  "0"
 
  EndSection
 
  EndSection
 
}}
 
}}
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== Modifying DPMS and screensaver settings using xset ==
 
== Modifying DPMS and screensaver settings using xset ==
  
It is possible to turn off your monitor using the ''xset'' tool which is provided by the {{Pkg|xorg-xset}} package in the [[official repositories]].
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It is possible to turn off your monitor using the ''xset'' tool which is provided by [[installing]] the {{Pkg|xorg-xset}} package.
{{Note|If using this command manually in a shell you may need to prefix it with {{ic|sleep 1;}} for it to work correctly. For example:
+
 
$ sleep 1; xset dpms force off
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{{Note|If using this command manually in a shell you may need to prefix it with {{ic|sleep 1;}} for it to work correctly, for example {{ic|sleep 1; xset dpms force off}}
 
}}
 
}}
  
To control Energy Star (DPMS) features (a timeout value of zero disables the mode):
+
Example commands:
$ xset -dpms Energy Star features off
 
$ xset +dpms Energy Star features on
 
$ xset dpms [standby [suspend [off]]]   
 
$ xset dpms force standby
 
$ xset dpms force suspend
 
$ xset dpms force off
 
$ xset dpms force on  (also implicitly enables DPMS features)
 
  
=== xset screen-saver control ===
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{| class="wikitable"
 +
! Command
 +
! Description
 +
|-
 +
| xset s off
 +
| Disable screen saver blanking
 +
|-
 +
| xset s 3600 3600
 +
| Change blank time to 1 hour
 +
|-
 +
| xset -dpms
 +
| Turn off DPMS
 +
|-
 +
| xset s off -dpms
 +
| Disable DPMS and prevent screen from blanking
 +
|-
 +
| xset dpms force off
 +
| Turn off screen immediately
 +
|-
 +
| xset dpms force standby
 +
| Standby screen
 +
|-
 +
| xset dpms force suspend
 +
| Suspend screen
 +
|}
  
You can use xset to control your screensaver:
+
{{Note|{{ic|dpms 0 0 0}}, which sets all the DPMS timeouts to zero, could be a better way to "disable" DPMS, since the effect of {{ic|-dpms}} would be reverted when, for example, turning off the screen with {{ic|xset dpms force off}}.}}
$ xset s [timeout [cycle]] 
 
$ xset s default   
 
$ xset s on
 
$ xset s blank             
 
$ xset s noblank   
 
$ xset s off
 
$ xset s expose           
 
$ xset s noexpose
 
$ xset s activate         
 
$ xset s reset
 
  
=== To see your current settings ===
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To query the current settings:
  
 
{{hc|$ xset q|
 
{{hc|$ xset q|
 
 
...
 
...
  
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}}
 
}}
  
== Examples ==
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See {{ic|xset}} for all available commands.
 
 
=== Turn off DPMS ===
 
 
 
$ xset -dpms
 
 
 
=== Disable screen saver blanking ===
 
 
 
$ xset s off
 
 
 
=== Disable DPMS and prevent screen from blanking ===
 
  
Useful when watching movies or slideshows:
+
{{Note|If using {{ic|xset}} in [[xinitrc]] does not work, specify settings within a file in {{ic|/etc/X11/xorg.conf.d/}}. See [[#Setting up DPMS in X]] for details.}}
$ xset -dpms; xset s off
 
  
=== Turn off screen immediately ===
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{{Warning|[[XScreenSaver]] and {{Pkg|xfce4-power-manager}} use their own DPMS settings and override ''xset'' configuration. See [[XScreenSaver#DPMS and blanking settings]] and [[Xfce#Display blanking]] for more information.}}
 
 
If you leave your computer, you do not need to wait for the timeout you set that the display turns off. Simply enforce it by using the ''xset'' command.
 
$ xset dpms force off
 
 
 
=== Put screen into standby ===
 
 
 
$ xset dpms force standby
 
 
 
=== Put screen into suspend ===
 
 
 
$ xset dpms force suspend
 
 
 
=== Change Blank time from 5 min to 1 hour ===
 
 
 
$ xset s 3600 3600
 
 
 
=== xset display.sh ===
 
 
 
You could also copy this script:
 
{{hc|/usr/local/bin/display.sh|<nowiki>
 
#!/bin/bash
 
# Small script to set display into standby, suspend or off mode
 
# 20060301-Joffer
 
 
 
case $1 in
 
    standby|suspend|off)
 
        xset dpms force $1
 
    ;;
 
    *)
 
        echo "Usage: $0 standby|suspend|off"
 
    ;;
 
  esac
 
</nowiki>}}
 
 
 
Make it executable ({{ic|chmod u+x /usr/local/bin/display.sh}}) and just run {{ic|display.sh off}}. For the latter to work you need to include {{ic|/usr/local/bin}} into your path.
 
  
 
== DPMS interaction in a Linux console with setterm ==
 
== DPMS interaction in a Linux console with setterm ==
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  $ for i in {0..256}; do setterm -powerdown 0 >> /dev/tty$i; done; unset i;
 
  $ for i in {0..256}; do setterm -powerdown 0 >> /dev/tty$i; done; unset i;
 
== Troubleshooting ==
 
 
=== xset DPMS settings do not work with xscreensaver ===
 
 
[[xscreensaver]] uses its own DPMS settings. See the settings for xscreensaver for more information.
 
 
==== xscreensaver DPMS ====
 
 
You can configure xscreensaver's DPMS settings manually by editing your {{ic|~/.xscreensaver}} file as below, or using the xscreensaver-demo GUI.
 
{{bc|
 
timeout: 1:00:00
 
cycle: 0:05:00
 
lock: False
 
lockTimeout: 0:00:00
 
passwdTimeout: 0:00:30
 
fade: True
 
unfade: False
 
fadeSeconds: 0:00:03
 
fadeTicks: 20
 
dpmsEnabled: True
 
dpmsStandby: 2:00:00
 
dpmsSuspend: 2:00:00
 
dpmsOff: 4:00:00
 
}}
 
  
 
== See also ==
 
== See also ==
  
 
* [http://webpages.charter.net/dperr/dpms.htm PC Monitor DPMS specification explanation]
 
* [http://webpages.charter.net/dperr/dpms.htm PC Monitor DPMS specification explanation]
 +
* [http://ptspts.blogspot.be/2009/10/screen-blanking-dpms-screen-saver.html DPMS control in X]

Latest revision as of 15:58, 10 July 2017

DPMS (Display Power Management Signaling) enables power saving behaviour of monitors when the computer is not in use. For details on each timeout, see [1]. Note that some monitors make no difference between various DPMS 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 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, 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 "ServerLayout"
    Identifier "ServerLayout0"
    Option "StandbyTime" "0"
    Option "SuspendTime" "0"
    Option "OffTime"     "0"
    Option "BlankTime"   "0"
EndSection

Modifying DPMS and screensaver settings using xset

It is possible to turn off your monitor using the xset tool which is provided by installing the xorg-xset package.

Note: If using this command manually in a shell you may need to prefix it with sleep 1; for it to work correctly, for example sleep 1; xset dpms force off

Example commands:

Command Description
xset s off Disable screen saver blanking
xset s 3600 3600 Change blank time to 1 hour
xset -dpms Turn off DPMS
xset s off -dpms Disable DPMS and prevent screen from blanking
xset dpms force off Turn off screen immediately
xset dpms force standby Standby screen
xset dpms force suspend Suspend screen
Note: dpms 0 0 0, which sets all the DPMS timeouts to zero, could be a better way to "disable" DPMS, since the effect of -dpms would be reverted when, for example, turning off the screen with xset dpms force off.

To query the current settings:

$ xset q
...

Screen Saver:
  prefer blanking:  yes    allow exposures:  yes
  timeout:  600    cycle:  600
DPMS (Energy Star):
  Standby: 600    Suspend: 600    Off: 600
  DPMS is Enabled
  Monitor is On

See xset for all available commands.

Note: If using xset in xinitrc does not work, specify settings within a file in /etc/X11/xorg.conf.d/. See #Setting up DPMS in X for details.
Warning: XScreenSaver and xfce4-power-manager use their own DPMS settings and override xset configuration. See XScreenSaver#DPMS and blanking settings and Xfce#Display blanking for more information.

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]
Note: If you haven't already read the brief DPMS article linked to below, please skim it to understand how DPMS can be used in the console the same as in X.

Prevent screen from turning off

You can run this command:

$ setterm -blank 0 -powerdown 0

Alternatively you can disable console blanking permanently using the following command:

# echo -ne "\033[9;0]" >> /etc/issue

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
Note: >> is used 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.

Bash loop to set ttys 0-256

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

See also