Date: Wed, 27 Jan 2016 20:04:20 +0100 From: Polytropon <freebsd@edvax.de> To: Andrea Venturoli <ml@netfence.it> Cc: freebsd-questions@freebsd.org Subject: Re: Log power button Message-ID: <20160127200420.f14b7a9a.freebsd@edvax.de> In-Reply-To: <56A9129A.5050707@netfence.it> References: <56A9129A.5050707@netfence.it>
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On Wed, 27 Jan 2016 19:55:22 +0100, Andrea Venturoli wrote:
> Hello.
>
> A server of mine (10.1) is "spontaneusly" rebooting.
> This is not a power failure/panic/crash/whatever, since it properly
> shuts down.
>
> I suspect someone is pushing the power button, but I have no physical
> way to check. Problem is, this is not reported in the logs.
There are two things that the power button can do:
(a) short press: The OS will take the required action (shut down);
(b) long press: The computer will be forced to power off (no OS shutdown,
no OS action) - equivalent to ripping out the power cord.
You can work with (a), and it will cause a log message. Case (b)
won't log anything as the system is _forced_ off.
> I vaguely remember older FreeBSD versions did this once, but I might be
> wrong; I cannot check on this box (100km away), but I tried on another
> one and, to my surprise, the fact that I pressed the power button was
> NOT logged.
Older FreeBSD versions that utilized APM could have a custom action
when pressing the power button as in case (a) mentioned above. The
corresponding file was /etc/apmd.conf. Today ACPI is being used for
controlling what happens when the button is pressed.
> Is there any way to enable this?
I'm not sure APM can be re-enabled, it's probably not present "in
hardware" anymore...
> Maybe I'm dumb, but I looked for this and found nothing.
No, it just doesn't really exist anymore, no matter how hard you look. :-)
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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