linux-kernel - Re: [REGRESSION] [2.6.37-rc1] Fan noise after suspend to ram/disk

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Message-Id: <201011162335.26220.rjw@sisk.pl>
Date:	Tue, 16 Nov 2010 23:35:26 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	maciej.rutecki@...il.com
Cc:	Zhang Rui <rui.zhang@...el.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>
Subject: Re: [REGRESSION] [2.6.37-rc1] Fan noise after suspend to ram/disk

On Tuesday, November 16, 2010, Maciej Rutecki wrote:
> On wtorek, 16 listopada 2010 o 02:26:15 Zhang Rui wrote:
> > On Tue, 2010-11-16 at 04:39 +0800, Maciej Rutecki wrote:
> > > On poniedziałek, 15 listopada 2010 o 04:16:35 Zhang Rui wrote:
> > > > On Tue, 2010-11-09 at 01:35 +0800, Maciej Rutecki wrote:
> > > > > On poniedziałek, 8 listopada 2010 o 07:58:52 Zhang Rui wrote:
> > > > > > IMO, the only one that may cause this regression is commit
> > > > > > c57b62f5b1e6dd69ff8c96f6db7f86ea31c0e21f
> > > > > > some app may enable polling via procfs and update the thermal zone
> > > > > > status.
> > > > > 
> > > > > I revert this commit from 2.6.37-rc1. Still the same:
> > > > could you please apply the patch attached, on top of 2.6.37-rc1, and
> > > > then attach the dmesg output if the fan is noise after suspend/resume.
> > > 
> > > Dmesg in attachement.
> > > 
> > > Starting suspend to ram from:
> > > [  104.602674] PM: Syncing filesystems ... done.
> > > resume OK, but next:
> > > [  144.298104] PM: Syncing filesystems ... done.
> > > after resume fan starts on full speed.
> > 
> > it seems that it's not the thermal driver that changes the Fan speed.
> > Please apply the debug patch attached, rebuild with CONFIG_ACPI_DEBUG
> > set and reboot with "acpi.debug_level=0x004
> > acpi.debug_layer=0x04A10000", and then attach the dmesg output after the
> > same test.
> > Please attach the acpidump output of this laptop as well.
> > 
> > thanks,
> > rui
> > 
> > > Regards
> 
> Revert 3e384ee6c687cb397581ee8f9440fc8220cfac80 seems solve problem:
> https://bugzilla.kernel.org/show_bug.cgi?id=22932#c3

Please do the test I asked for in the bug entry.

Thanks,
Rafael
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