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Operating Systems AIX Automatic Server bootup after power outage? Post 302951351 by Corona688 on Wednesday 5th of August 2015 11:22:29 AM
Old 08-05-2015
There is usually a BIOS setting for "turn on after power loss", yes. It's a setting in the motherboard itself which you get into via a menu before the OS even boots. This makes it highly system-specific as well, some systems use F10 on boot to get to that menu, some use F2, some use DEL, etc, and where the option is found also varies. You'll have to research and explore.

Unfortunately, since the BIOS settings are very often corrupted and reset to defaults in power loss situations, the BIOS "power on after power loss" setting is very untrustworthy anyway.

There was one model of PC back in 1997 which had a switch on the motherboard to configure behavior after power loss. They're the only computers I've encountered which I could actually trust to do so.
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DETECTUPS(8)						      System Manager's Manual						      DETECTUPS(8)

NAME
detectups - UPS detection/powerd configuration generator SYNOPSIS
/sbin/detectups [tty] DESCRIPTION
detectups monitors the serial port connected to an UPS device and will attempt to determine the method of UPS notification of power outage. It will ask you to remove the power cord from the wall to the UPS, or push the UPS's test button. It will then determine what all has hap- pened and ask to generate a config file based on your UPS and cable configuration. detectups needs to watch a tty with modem control prop- erties. Please refer to the powerd documentation for further information. ARGUMENTS
Serial-Device Some serial port that is not being used by some other device, and does not share an interrupt with any other serial port. /etc/powerd.conf FILES
/etc/powerd.conf powerd configuration file that detectups generates /etc/inittab init is what actually issues the shutdown SEE ALSO
powerd(8), shutdown(8), wall(1), inittab(5). AUTHOR
James Brents <James@nistix.com> (with parts of this man page borrowed from all over the Linux community) DETECTUPS(8)
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