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From: Josef Moellers <josef.moellers@invalid.invalid>
Newsgroups: comp.os.linux.development.system
Subject: How to find cause of boot?
Date: Sat, 28 Jul 2012 14:38:55 +0200
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I'd like to find out why my system was booted: because someone hit the
power button or whether it was woken by the on-board RTC.
The background is that I use a small system as a PVR but it can only set
the wakeup timer a max of one day in advance. So, when the machine is
woken by the RTC, I'd like to check whether a recording is imminent and,
if not, shut down again.

Josef