linux-kernel - Re: 2.6.23-rc4-mm1 - git-alsa.patch breaks audio on Dell Latitude D820

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Date:	Wed, 05 Sep 2007 22:11:20 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Valdis.Kletnieks@...edu
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc4-mm1 - git-alsa.patch breaks audio on Dell Latitude D820

At Wed, 05 Sep 2007 15:46:34 -0400,
Valdis.Kletnieks@...edu wrote:
> 
> On Fri, 31 Aug 2007 21:58:22 PDT, Andrew Morton said: 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc4/2.6.23-rc4-mm1/
> 
> git-alsa.patch breaks audio on my laptop, worked fine in -rc3-mm1.  Almost
> certainly bustification in the Intel HDA rewrite.
> 
> Symptoms:  alsamixer finds the chipset, can adjust the volumes and mute/unmute,
> and /usr/bin/play is able to write a .wav to the ALSA device without complaint.
> However, no sound actually comes out.  Very "lights are on but nobody is home".
> 
> Dell Latitude D820, lspci reports:
> 
> 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
> and alsamixer reports finding a "SigmaTel STAC9200"
> 
> % grep HDA_ .config
> CONFIG_SND_HDA_INTEL=y
> # CONFIG_SND_HDA_HWDEP is not set
> CONFIG_SND_HDA_CODEC_REALTEK=y
> CONFIG_SND_HDA_CODEC_ANALOG=y
> CONFIG_SND_HDA_CODEC_SIGMATEL=y
> # CONFIG_SND_HDA_CODEC_VIA is not set
> # CONFIG_SND_HDA_CODEC_ATIHDMI is not set
> # CONFIG_SND_HDA_CODEC_CONEXANT is not set
> # CONFIG_SND_HDA_CODEC_CMEDIA is not set
> # CONFIG_SND_HDA_CODEC_SI3054 is not set
> CONFIG_SND_HDA_GENERIC=y
> # CONFIG_SND_HDA_POWER_SAVE is not set
> 
> dmesg under -rc4-mm1:
> Advanced Linux Sound Architecture Driver Version 1.0.14 (Fri Jul 20 09:12:58 2007 UTC).
> ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 21 (level, low) -> IRQ 21
> hda_intel: position_fix set to 1 for device 1028:01cc
> ALSA device list:
>   #0: HDA Intel at 0xefffc000 irq 506
> 
> dmesg under -rc3-mm1:
> 
> Advanced Linux Sound Architecture Driver Version 1.0.14 (Fri Jul 20 09:12:58 2007 UTC).
> ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 21 (level, low) -> IRQ 21
> hda_intel: position_fix set to 1 for device 1028:01cc
> ALSA device list:
>   #0: HDA Intel at 0xefffc000 irq 506
> 
> (Yes, they look the same to me, too...)
> 
> I'd provide more info, if I had a clue what else to add...

First, check /proc/asound/card0/codec#* whether STAC9200 is identified
properly?  If yes, check the mixer contents (at best, run
"alsactl -f somefile store"), see whether "Master Playback Volume" is
raised, "Master Playback Switch" unmuted, "Front..." raised/unmuted,
and "PCM ..." raised/unmuted, etc.

If this still doesn't work, try to give model=ref option to
snd-hda-intel.  If it still not OK, please try bi-sect of
git.kernel.org/perex/alsa.git mm branch...


Takashi
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