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Re: Monitor switched off after resume from hibernation

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On Mon, Jan 9, 2017 at 10:01 AM, David Wright <deblis@lionunicorn.co.uk>
wrote:
> 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),

Cheap power supply designs. I think he indicated.

Without load, some power supply designs draw more energy, either in
not-fully-defined operating modes or in modes where the P/S loads itself
down dynamically.

> 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.
>



-- 
Joel Rees

I'm imagining I'm a novelist:
http://reiisi.blogspot.jp/p/novels-i-am-writing.html

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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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