Determine power-on cause?

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Hello!

Is it possible to determine the cause for power-on, that is
	push of power-button on chassis
	automatic power-on after power-loss (BIOS: return to previous state/on)
	wake-on-lan
	wake by RTC / ACPI-alarm
	etc...

I ask because I have a PC which I use for desktop work and for video
recording. I'd like my PC to
1. power on via RTC just before a scheduled recording, not starting any
desktop environment or server software,
2. start my desktop environment when I push the power-on-button
3. start some server-software when I wake up the PC via wake-on-lan
4. check for scheduled recordings after a power failure and power-off
until than.

	dmidecode -t 1 | grep "Wake-up Type"
seems to be static and never changes on my 2 test-pcs and 2 laptops.

That you for your advice in advance.
Please cc-me on replies since I'm not subscribed to linux-acpi.

BYtE
Philipp
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  / /  (_)__  __ ____  __ Philipp Hahn
 / /__/ / _ \/ // /\ \/ /
/____/_/_//_/\_,_/ /_/\_\ pmhahn@xxxxxxxxxxxxx
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