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

[Takashi Iwai]

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.

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

> 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.

Looking at each patch...

> Subject: [PATCH 1/4] ALSA: HDA: Enable surround and subwoofer on Lenovo Ideapad Y530
> 
> The pin config values would change the association instead of the
> sequence, this commit fixes that up.

This looks good.

> Subject: [PATCH 2/4] ALSA: HDA: Fix volume control naming for surround speakers on Realtek auto-parser
> 
> When more than one pair of internal speakers is present, allow names
> according to their channels.

This one is for re-consideration.

> From: David Henningsson <david.henningsson at canonical.com>
> Date: Fri, 4 Mar 2011 14:22:25 +0100
> Subject: [PATCH 3/4] ALSA: HDA: Fixup unnecessary volume control index on Realtek ALC88x
> 
> Without this change, a volume control named "Surround" or "Side" would
> get an unnecessary index, causing it to be ignored by the vmaster and
> PulseAudio.

vmaster should handle multiple indices properly, but maybe PA not.
Nevertheless, the fix is correct.

> Subject: [PATCH 4/4] ALSA: HDA: Realtek ALC88x: Do not over-initialize speakers and hp that are primary outputs
> 
> Do not initialize again the what has already been initialized as
> multi outs, as this breaks surround speakers.

This looks correct, too.


thanks,

Takashi