20 Mar
2013
20 Mar
'13
8:33 p.m.
On 03/20/2013 12:41 PM, Fred Smith wrote:
I recall, from reading docs in either nut, or the apc package for linux (don't recall which) that many USB UPSes do have signalling between the UPS and the computer to tell the UPS to shut itself off when the system has gone offline. So, I've been assuming that's what is happening in my case.
That's handled by /etc/init.d/halt. It only happens if you have nut or APC's software installed and configured. Take a look at the script, it's the last thing that happens if UPS management software is present. If not, then the system will try kexec or halt.