[alsa-devel] [PATCH 1/2] thinkpad-acpi: Try to use full software mute control

[Andy Lutomirski]

On Thu, Oct 16, 2014 at 12:58 PM, Henrique de Moraes Holschuh
<hmh at hmh.eng.br> wrote:
> On Thu, 16 Oct 2014, Andy Lutomirski wrote:
>> On Thu, Oct 16, 2014 at 11:54 AM, Henrique de Moraes Holschuh
>> <hmh at hmh.eng.br> wrote:
>> So the question is: are there IBM models (or models that don't send
>> KEY_MUTE, anyway) that nonetheless expose HAUM and SAUM?  If not, then
>> my patch should be okay.  If so, we'll need further filtering.
>
> No, these were introduced in the X61/T61.  Still, the standard paranoia
> applies, and you should check for HAUM/SAUM only on VENDOR_LENOVO, and
> assume they don't exist (because if they do, they are something else) for
> VENDOR_IBM.

Done in v3.

My X220 seems to be alive again for the time being -- I suspect that
there's a marginal connection somewhere.  It seems to be fully
functional with this match, and the mute light works as expected
(thanks, Takashi et al!).

--Andy