linux-kernel - if power button pressed 1x it creates the same ACPI event twice

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Message-ID: <618666178.20150113173510@eikelenboom.it>
Date:	Tue, 13 Jan 2015 17:35:10 +0100
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>
CC:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: if power button pressed 1x it creates the same ACPI event twice

Hi Rafael / Len,

When i press the power-button on my intel NUC, i get twp ACPI power-events shortly 
after one another (within a second), instead of just one. 

It doesn't matter if i have the old /proc/acpi interface enabled or disabled in the kernel config.

I have tested a few older kernels lingering around on the box and 3.14 already 
has this problem. 3.2 (from the debian repo) doesn't have the problem, it only 
fires one event.

I did find another report:
    Re: lenovo ultrabay docking station: if power button pressed 1x it creates 2x the same ACPI event
    http://www.spinics.net/lists/linux-acpi/msg54723.html
But that hasn't come to a conclusion ...

Unfortunately 3.2 - 3.19-rc4 is a bit of a largish bisect window, so that's 
unfeasible :-)

I compiled in apci debug support and tried:
 echo "0x00080000" > /sys/module/acpi/parameters/debug_layer
 echo "0xffffffff" > /sys/module/acpi/parameters/debug_level

But i don't get any extra output in dmesg ?

Do you have any ideas for a debug patch or better values to figure out what is going on ?

--
Sander

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