linux-kernel - Re: swsusp and suspend2 like to overheat my laptop

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Date:	Wed, 9 Aug 2006 14:07:34 +0200
From:	Andreas Mohr <andi@...x01.fht-esslingen.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Pavel Machek <pavel@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	Suspend2-devel@...ts.suspend2.net, linux-pm@...l.org,
	ncunningham@...uxmail.org
Subject: Re: swsusp and suspend2 like to overheat my laptop

On Wed, Aug 09, 2006 at 07:45:23AM -0400, Steven Rostedt wrote:
> It does look like something isn't setting up the ACPI power properly on
> resume, and that the CPU is probably in a busy loop while the machine is
> idle.  Just a guess.

In that case could you post
cat /proc/acpi/processor/CPU?/*
?

Perhaps we're losing ACPI C2/C3 state power saving, and checking
the busmaster activity indicators there would be useful, too.

Oh, in this context maybe it's actually a problem of a misbehaving driver?
An active USB mouse is known to distort ACPI power saving, causing reduced
notebook battery operation length (due to busmaster activity preventing
ACPI idling, I think). Now what if some certain driver actually caused
permanent busmaster activity...?

Andreas Mohr
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