On Mon, Jan 9, 2017 at 10:01 AM, David Wright <deb...@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
