Difference between revisions of "Display Power Management Signaling"

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(Added info about xscreensaver)
m (much more detailed xset info)
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= DPMS Interaction using xset =
 
= DPMS Interaction using xset =
It is possible to turn off your monitor using the <code>xset</code> tool.
+
It is possible to turn off your monitor using the <code>xset</code> tool. Note that you may need to prefix the command with <code>sleep 1;</code> for it to work correctly.  For example:
 +
sleep 1; xset dpms force off
 +
 
 +
To control Energy Star (DPMS) features (a timeout value of zero disables the mode):
 +
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)
 +
 
 +
 
 +
 
 +
 
 +
==To see your current settings==
 +
xset q
 +
<pre>
 +
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
 +
</pre>
 +
 
 +
==Put screen into standby==
 
  xset dpms force standby
 
  xset dpms force standby
puts the screen(s) into standby,
+
 
 +
==Put screen into suspend==
 
  xset dpms force suspend
 
  xset dpms force suspend
makes them to suspend and
+
 
 +
==Turn off screen immediately==
 +
If you leave your computer, you don't 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
 
  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 <code>sleep 1;</code> for it to work correctly.  For example,
 
sleep 1; xset dpms force off
 
  
 +
== Disable DPMS and prevent screen from turning off ==
 +
Useful when watching movies or slideshows (thanks damir):
 +
xset -dpms;xset s off
 +
 +
==Turn off DPMS==
 +
xset -dpms
 +
 +
==Disable screen saver blanking==
 +
xset s off
 +
 +
 +
==xset screen-saver control==
 +
You can use xset to control your screensaver:
 +
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
 +
 +
==xset display.sh==
 
You could also copy this script:
 
You could also copy this script:
 
{{file|name=/usr/local/bin/display.sh|content=
 
{{file|name=/usr/local/bin/display.sh|content=
Line 56: Line 108:
 
  # Without /usr/local/bin in your PATH
 
  # Without /usr/local/bin in your PATH
 
  /usr/local/bin/display.sh standby
 
  /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
 
 
xset -dpms
 
 
This one disables screen saver blanking:
 
 
xset s off
 
 
 
  
 
= DPMS Interaction in a console with setterm =
 
= DPMS Interaction in a console with setterm =

Revision as of 15:53, 27 October 2010

Template:I18n links start Template:I18n entry Template:I18n entry Template:I18n links end

DPMS (Display Power Management Signaling) is a technology that allows power saving behaviour of monitors when the computer is not in use.

Setting up DPMS in X

Add the following to your /etc/X11/xorg.conf in the Monitor section:

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

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 tool. 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

To control Energy Star (DPMS) features (a timeout value of zero disables the mode):

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) 



To see your 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

Put screen into standby

xset dpms force standby

Put screen into suspend

xset dpms force suspend

Turn off screen immediately

If you leave your computer, you don't 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


Disable DPMS and prevent screen from turning off

Useful when watching movies or slideshows (thanks damir):

xset -dpms;xset s off

Turn off DPMS

xset -dpms

Disable screen saver blanking

xset s off


xset screen-saver control

You can use xset to control your screensaver:

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

xset display.sh

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

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.

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 (in console)

$ setterm -blank 0 -powerdown 0

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

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.

$ 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;

Troubleshooting

xset DPMS settings don't work with xscreensaver

xscreensaver uses it's own DPMS settings. See the settings for xscreensaver for more information.

External Resources