On 02/03/18 03:09, Marc Auslander wrote: >> I think you can usually set the power-on behaviour in the BIOS (or EFI, >> presumably) - independently of the OS or any shutdown process. >> >> Richard > So here's the issue - maybe I'm missing something. > > If I configure apcupsd to shutdown on power fail and the power really > stays off till the apc unit shut down, my machine will reboot on power > up. But what if the power comes back once the daemon has started the > shutdown? > > What is needed is a guaranteed power cycle from the apc unit - which > AFAIK is not an option. Interesting point. I confess I've never set up a ups for all this before, but I've read about it ... I'm pretty sure you can instruct the ups to shut down, but I don't know whether you can tell it to come back as soon as the power is stable (possibly immediately). I guess you could go more extreme, and have the ups controlled by something else, like a battery-powered Raspberry Pi ... does the ups listen for instructions in its 'down' state? Richard
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