linux-kernel - Re: [REGRESSION]fan turns at highspeed after suspend2ram

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Date:	Sun, 10 Feb 2008 09:52:22 -0800
From:	"Ray Lee" <ray.lee@...sys.com>
To:	"Mirco Tischler" <mt-ml@....de>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"Len Brown" <len.brown@...el.com>, "Pavel Machek" <pavel@...e.cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [REGRESSION]fan turns at highspeed after suspend2ram

On Feb 10, 2008 9:21 AM, Mirco Tischler <mt-ml@....de> wrote:
> Hi
>
> I think I found a regression in 2.6.24-git. After waking up from suspend
> 2 ram, the fan of my laptop turns constantly at highest speed. It didn't
> do this in 2.6.24.
>
> I bisected it down to this commit:
>
> commit c95d47a868f35cd47643d116a3c680cdaa954df8
> Author: Rafael J. Wysocki <rjw@...k.pl>
> Date:   Tue Jan 8 00:05:21 2008 +0100
>
>     ACPI: Separate invocations of _GTS and _BFS from _PTS and _WAK
>
> Reverting it resolves the problem for me, but I can't say if this makes
> any sense.
>
> My machine is a Zepto laptop with Intel Santa-Rosa chipset and I'm
> running
> a x86_64 Ubuntu Gutsy.

I just noticed the same problem. After about ten minutes, it seems
like all the ACPI events got 'unstuck' -- my screen's backlight went
up and down a couple of times (and battery/AC indicator flipped a
couple of times) responding to previous power loss and gain events, I
think, and the fans dropped down from high speed to low.

I was chalking it up to another charming bug on my HP nx6125, but if
someone else is seeing it too...

I'm on Ubuntu, x86_64, and git as of a couple days ago as well. I
haven't tried reverting the patch.
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