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Date:	Tue, 10 Nov 2009 17:43:56 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	bdale@....com (Bdale Garbee)
Cc:	linux-kernel@...r.kernel.org
Subject: Re: problem with codec discovery on HP 2530p

At Tue, 10 Nov 2009 09:53:38 -0500 (EST),
Bdale Garbee wrote:
> 
> I recently moved from 2.6.30.9 to the 2.6.32-rcX series on my HP EliteBook 
> 2530p.  Audio didn't work, and I've finally made time to track down the 
> problem.  It turns out the problem actually started with 2.6.31-rc1, due
> to a patch that was part of the 2.6.30-rcX series but apparently wasn't in
> the 2.6.30 stable release.  
> 
> The symptom is:
> 
> HDA Intel 0000:00:1b.0: power state changed by ACPI to D0
> HDA Intel 0000:00:1b.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
> HDA Intel 0000:00:1b.0: irq 30 for MSI/MSI-X
> HDA Intel 0000:00:1b.0: setting latency timer to 64
> hda-intel: Codec #0 probe error; disabling it...
> hda-intel: spurious response 0x0:0x0, last cmd=0x0f0000
> hda-intel: no codecs initialized
> hda-intel: spurious response 0x0:0x0, last cmd=0x0f0000
> HDA Intel 0000:00:1b.0: PCI INT A disabled

Hm, looks like the codec communication got screwed up by some reason.

> The codec in this machine is an AD1984A.  Bisecting, I discovered that 
> reverting this single commit fixes things for me in 2.6.32-rc6:
> 
> 8174086167d43d0fd7b21928074145ae1d15bbab is the first bad commit
> commit 8174086167d43d0fd7b21928074145ae1d15bbab
> Author: Takashi Iwai <tiwai@...e.de>
> Date:   Tue May 26 15:22:00 2009 +0200
> 
>     ALSA: hda - Allow concurrent RIRB access in single_cmd mode

This commit itself is unlikely relevant, I guess.
It's only for single-cmd mode, which is the last fallback if the
codec communication fails.  That is, if this change does have any
influence, it means that the device is already in a weird status.

Could you give alsa-info.sh output (run with --no-upload option)
on the working (2.6.30.x) kernel?

Also, what module options do you give to snd-hda-intel?


thanks,

Takashi
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