Re: Monitor switched off after resume from hibernation

From	David Wright <deblis@lionunicorn.co.uk>
Newsgroups	linux.debian.user
Subject	Re: Monitor switched off after resume from hibernation
Date	2017-01-09 02:10 +0100
Message-ID	<sXwDf-5IQ-7@gated-at.bofh.it> (permalink)
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On Sun 08 Jan 2017 at 07:59:39 (+0100), solitone wrote:
> On Saturday, January 7, 2017 1:35:07 PM CET David Wright wrote:
> > you could go on to combine it with the
> > hibernation process to make sure that the monitor was on just before
> > hibernation started. (There might be some sort of serialisation
> > required to make sure the two actions occur in the right order. You
> > don't want a race.)
> 
> What sort of serialisation are you referring to? I tried with the following 
> script, but won't work:
> 
> $cat /usr/lib/systemd/system-sleep/screen_hack_hibernate
> 
> if [ "$2" = "hibernate" ]; then
>     case "$1" in
>         pre)
>             xset -display :0 dpms force on
>             ;;
>     esac
> fi
> 
> I thought it would be run just before hibernate (it's the same technique I use 
> to unload the driver of my wifi adapter before hibernate, to prevent some other 
> network issues I had) , but it doesn't.

I can only answer you in the vaguest terms. I thought you might add a
service that has to run before hibernate, and it would contain a
Before= (or hibernate an After= ) line to make sure that turning on
the monitor preceeded the hibernation.

If you manage this, perhaps with others' help, you'll be ahead of me
on the systemd learning curve.

BTW I haven't bothered to respond to Stefan Monnier's contribution.
I can imagine scenarios that might cause power consumption when a
machine is off (like network cards running to watch for magic WoL
packets, and things like that), but a machine in hibernation should
cope with a power cut. In any case, I support your expectation that
using sleep/hibernate should not involve compromising monitors'
power-saving behaviour.

Cheers,
David.

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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