[alsa-devel] [PATCH] Four patches to fixup surround internal speakers on Realtek 88x

David Henningsson david.henningsson at canonical.com
Mon Mar 7 11:46:29 CET 2011

On 2011-03-07 10:37, Takashi Iwai wrote:
> At Mon, 07 Mar 2011 09:22:42 +0100,
> David Henningsson wrote:
>> I spend last Friday together with Bartłomiej Żogała fixing up a long
>> standing issue with Lenovo Y530, which has 4+1 internal speakers on a
>> Realtek 888. And we all want that supported by the auto parser, don't
>> we?
> Well, it's a bit flaky.  The current behavior assigning speakers only
> as "Speaker" is intentional.  This is a simplification to avoid the
> conflict with the case where both multiple line-outs and multiple
> speakers are present.

In that case, nothing changes - this code path is not taken, since 
line_out_type wouldn't be AUTO_PIN_SPEAKER_OUT.

> And, in general, I don't like to get rid of "Speaker" notation.  If
> any, we should keep "Speaker" with a channel prefix.

This is indeed tricky, and I think we've stranded on a similar issue 
here once before.

Btw, in the case of this particular machine, the "Front" controls the 
headphones as well, so the name is accidentally correct.

I've even seen a machine where a DAC controlled two out of three fronts 
(e g headphones and line-out but not speaker, or something like that) - 
how would you name that?

Perhaps it is time to start to come up with a more reliable naming 
scheme for 2.6.39 or 2.6.40, that would take into account the more 
trickier combinations as well.

>> So here comes the patches. Would be nice to have in 2.6.38.
> Sorry, the speaker-change is too intrusive for 2.6.38.
> Since I already sent a pull request yesterday, which is supposed to be
> the final one unless major fixes come up, I'll queue this later with
> stable-kernel tag.

Ok, that works well for me.

David Henningsson, Canonical Ltd.

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