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Re: Monitor switched off after resume from hibernation

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On Fri 06 Jan 2017 at 22:00:45 (+0100), solitone wrote:
> On Thursday, January 5, 2017 7:52:20 PM CET David Wright wrote: 
> > Do you perhaps need
> > 
> > xset -display <something> dpms force on
> > 
> > in the systemd script?
> 
> no, I've also tried with the -display option, but I don't get anything, with 
> that command in either the pre block or the post block.
> 
> BTW, on my system the -display option doesn't seem to be needed, because if I 
> do:
> 
> $ sleep 1; xset dpms force off; sleep 2; xset dpms force on
> 
> in a terminal, the screen switches off and on as expected.

Yes, but in your terminal, you'll probably find that
$ echo $DISPLAY
will give you :0 (locally) or localhost:10.0 (if you ssh into
another computer). So your terminal's xset command will be
happy without -display as it's got $DISPLAY instead.

$ xset c 99                                 # good
$ xset c 1                                  # good
$ xset -display :1 c 99                     # bad
xset:  unable to open display ":1"
$ DISPLAY="" xset c 99                      # bad
xset:  unable to open display ""
$ DISPLAY="" xset -display :0 c 99          # good
$ 

I'm assuming that a systemd command that suddenly pops up from nowhere
will not have a suitable value for $DISPLAY.

If I put
*       *       *       *       *       /usr/bin/xeyes
into my crontab, I get an error message mailed to me
every minute as above. If I replace it with
*      *       *       *       *       DISPLAY=":0" /usr/bin/xeyes
I get a new pair of eyes popping up on the screen every minute.

Cheers,
David.

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Thread

Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-05 22:10 +0100
  Re: Monitor switched off after resume from hibernation Keith Bainbridge <keithrbaugroups@gmail.com> - 2017-01-06 01:20 +0100
    Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-06 03:00 +0100
      Re: Monitor switched off after resume from hibernation Keith Bainbridge <keithrbaugroups@gmail.com> - 2017-01-06 06:20 +0100
        Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-06 15:30 +0100
          Re: Monitor switched off after resume from hibernation Stefan Monnier <monnier@iro.umontreal.ca> - 2017-01-06 22:50 +0100
      Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 22:10 +0100
        Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-07 05:00 +0100
          Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 08:20 +0100
            Re: Monitor switched off after resume from hibernation Joe <joe@jretrading.com> - 2017-01-07 10:10 +0100
              Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 16:10 +0100
              Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 19:40 +0100
            Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-07 20:40 +0100
              Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 21:30 +0100
              Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-08 08:10 +0100
                Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-09 02:10 +0100
                Re: Monitor switched off after resume from hibernation Joel Rees <joel.rees@gmail.com> - 2017-01-09 13:50 +0100
                Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-09 15:20 +0100
    Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 07:00 +0100
      Re: Monitor switched off after resume from hibernation Keith Bainbridge <keithrbaugroups@gmail.com> - 2017-01-06 07:30 +0100
        Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 13:20 +0100
      Re: Monitor switched off after resume from hibernation Charlie Kravetz <cjk@teamcharliesangels.com> - 2017-01-06 15:40 +0100
        Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 20:50 +0100
          Re: Monitor switched off after resume from hibernation Charlie Kravetz <cjk@teamcharliesangels.com> - 2017-01-06 23:20 +0100
            Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 08:00 +0100
  Re: Monitor switched off after resume from hibernation Joel Rees <joel.rees@gmail.com> - 2017-01-09 14:10 +0100
    Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-09 19:00 +0100
      Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-22 14:40 +0100

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