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

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Date:	Tue, 16 Nov 2010 09:26:15 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	"maciej.rutecki@...il.com" <maciej.rutecki@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [REGRESSION] [2.6.37-rc1] Fan noise after suspend to ram/disk

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


View attachment "patch-thermal-debug-2" of type "text/x-vhdl" (597 bytes)