linux-kernel - Re: [ibm-acpi-devel] [PATCH] thinkpad-acpi: disable alsa volume mixer for SL410/SL510

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Date:	Thu, 13 Oct 2011 15:07:56 +0800
From:	Keng-Yü Lin <kengyu@...onical.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org,
	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	linux-kernel@...r.kernel.org, Matthew Garrett <mjg@...hat.com>
Subject: Re: [ibm-acpi-devel] [PATCH] thinkpad-acpi: disable alsa volume mixer
 for SL410/SL510

On Fri, Oct 7, 2011 at 2:12 AM, Henrique de Moraes Holschuh
<hmh@....eng.br> wrote:
> On Thu, 06 Oct 2011, Keng-Yü Lin wrote:
>> On Thu, Mar 17, 2011 at 2:57 AM, Henrique de Moraes Holschuh
>> <hmh@....eng.br> wrote:
>> > On Tue, 15 Mar 2011, Keng-Yu Lin wrote:
>> >> The mute key on SL410/SL510 only works when the alsa volume mixer
>> >> is not enabled. This patch makes the alsa volume mixer disabled
>> >> on the matched SL410/SL510 EC versions.
>> >
>> > I'd like more data on this.  Is this some sort of weird interaction with
>> > userspace, or does the firmware actually changes behaviour when we
>> > enable the MUTE HKEY event in the event mask?
>>
>> The firmware does not change its behaviour with the key enabled in the keymask.
>> The mute key (and the LED on it) of the two models works good without
>> thinkpad_acpi loaded. So in the patch I like to exclude the volume
>> control part for the two models.
>
> If the firmware does not change behaviour, doesn't that mean the bug is
> elsewhere?
>
> Is the firmware reporting these keys somewhere else (e.g. through the
> keyboard)?
>

As the users reported in https://launchpad.net/bugs/595896, there is
no KEY_MUTE either from thinkpad_acpi nor the keyboard when pressing
the mute hotkey. (I do not really possess the hardware. but just
debugged/helped remotely).

It will be really appreciated if there is any suggestion/insight for
looking into the bug.  At the moment I can just find this fix for the
issue.
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