linux-kernel - Re: 3.8-rc1 patch_cirrus 4.0 regression...

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Date:	Tue, 05 Feb 2013 17:16:32 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Daniel J Blueman <daniel@...ra.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org
Subject: Re: 3.8-rc1 patch_cirrus 4.0 regression...

At Wed, 6 Feb 2013 00:10:30 +0800,
Daniel J Blueman wrote:
> 
> Hi Takashi,
> 
> The v3.8-rc kernels have regressed from v3.7 with the quad-speaker
> arrangement on my Macbook Pro 10,1 - only the higher-frequency
> speakers work despite the front and rear channels being exposed in the
> mixer.

Interesting.  So you have a machine with 4.0 built-in speaker instead
of 2.1?  Then we need to add a device-specific flag for it.  Currently
the driver assumes 2.1 system blindly because majority of machines
have that.

FWIW, the codec parser code has been totally rewritten for 3.9, so any
patch to 3.8 won't be applied to 3.9 (and vice versa)...

Could you give alsa-info.sh output on 3.8 kernel?  Then I'll try to
cook it for 3.9 (and maybe backport to 3.8).


Takashi

> 
> Reverting f37bc7 [1] restored the correct behaviour ([2] was reverted
> to compile, but the problem still occurs with only [2] reverted).
> 
> How can I help to debug this and find the right approach?
> 
> Thanks,
>   Daniel
> 
> --- [1]
> 
> commit f37bc7a88d374448a1f4bba9267d308606d78bf2
> Author: Takashi Iwai <tiwai@...e.de>
> Date:   Thu Nov 8 15:59:23 2012 +0100
> 
>     ALSA: hda - Give standard "Bass Speaker" mixer for 2.1 speakers
> 
>     When two built-in speakers are found on the machine, we can suppose
>     it's rather a 2.1 speaker system with a bass output instead of
>     front/surround channels.
> 
>     Signed-off-by: Takashi Iwai <tiwai@...e.de>
> 
> --- [2]
> 
> commit ee81abb623cb5e03c182d16871bb4fb34fdc9b4f
> Author: Takashi Iwai <tiwai@...e.de>
> Date:   Thu Nov 8 17:12:10 2012 +0100
> 
>     ALSA: hda - Apply a proper chmap for built-in 2.1 speakers
> 
>     When 2.1 speakers are detected, use the corresponding channel map
>     instead of the standard map with front+rear surrounds.
> 
>     Signed-off-by: Takashi Iwai <tiwai@...e.de>
> -- 
> Daniel J Blueman
> 
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