linux-kernel - How to determine what hardware initiated a wake? Better tools required?

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Message-ID: <550C4AC8.1000405@malch.com>
Date:	Fri, 20 Mar 2015 09:28:56 -0700
From:	Malcolm Hoar <malch@...ch.com>
To:	linux-kernel@...r.kernel.org
Subject: How to determine what hardware initiated a wake? Better tools required?

I have been struggling to solve a problem with a system that
unexpectedly wakes up (from an S5 state).

I have searched the log files to no avail. Mr Google reveals
others will the same problem, but no meaningful solutions as
far as I can tell.

Even when I intentionally wake the system from S5 (via WOL for
example) I am unable to find that event reflected anywhere in
the logs. Booting with acpi.debug_layer=0xffffffff and
acpi.debug_level=0x2 didn't seem to help either.

It seems to me that we need a better diagnostic tool for
tracing the source of wake events; something akin to the
Windows powercfg -lastwake command.

-- 
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
| Malcolm Hoar           "The more I practice, the luckier I get". |
| malch@...ch.com                                     Gary Player. |
| http://www.malch.com/                                            |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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