Wake monitor from sleep remotely

Question

I have an Ubuntu server running xdm with openbox on which is plugged a monitor that displays a video which is launched via a cron daemon.

When the monitor is not used for a certain amount of time, it goes into sleep mode and I cannot wake it up with the video process : The monitor stays black.

How can I wake the monitor? Without installing packages if possible, and without a physical access to the machine.

score 17 · Accepted Answer · answered Apr 15 '14 at 13:44

17

xset --help

usage:  xset [-display host:dpy] option ...

    To control Energy Star (DPMS) features:
    -dpms      Energy Star features off
    +dpms      Energy Star features on
     dpms [standby [suspend [off]]]
          force standby
          force suspend
          force off
          force on
          (also implicitly enables DPMS features)
          a timeout value of zero disables the mode

So if you get the ${DISPLAY} of the monitor you can:

xset -display ${DISPLAY} dpms force on

answered Apr 15 '14 at 13:44

mikeserv

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What if I do it via `ssh`? – Deer Hunter Apr 15 '14 at 13:48
@DeerHunter Then you use the display number. – mikeserv Apr 15 '14 at 13:49
it works (without the need to specify the display (I have only one)). Thanks ! – Jav Apr 15 '14 at 13:50
@Jav - I'm glad to hear it. – mikeserv Apr 15 '14 at 14:00
and I meant : it works via ssh – Jav Apr 15 '14 at 14:08
Will this disable automatic sleep timer? – Michael May 03 '16 at 09:04
I'll let you know in 30 minutes – Colin Jun 13 '18 at 18:52
@Michael No it won't. – Colin Jun 13 '18 at 18:56
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`xset -display :0 dpms force on` works for me when I log in via ssh – mixtly87 Oct 20 '19 at 21:45

Wake monitor from sleep remotely

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