linux-kernel - Re: intel-hda sound too quiet in linux-2.6.25-rc6

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Message-ID: <20080318074158.GA1924@freya.yggdrasil.com>
Date:	Tue, 18 Mar 2008 00:41:58 -0700
From:	"Adam J. Richter" <adam@...drasil.com>
To:	"Adam J. Richter" <adam@...drasil.com>
Cc:	tiwai@...e.de, pshou@...ltek.com.tw, matt.jared@...el.com,
	andy.kopp@...el.com, dan.d.kogan@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: intel-hda sound too quiet in linux-2.6.25-rc6

On Mon, Mar 17, 2008 at 11:23:59PM -0700, Adam J. Richter wrote:
>         I have a motherboard that uses the AMD am690g chip set,
> which has a sound hardware called "azalia", which apparently is
> controlled by linux/sound/pci/hda/hda_intel.c.
> 
> 	The audio works fine under linux-2.6.24.2.  However, in
> linux-2.6.25-rc3 (haven't tried earlier ones) through 2.6.25-rc6
> (released a couple of hours ago), the audio is barely audible unless I
> crank up my speakers to the maximum volume, at which point I can hear
> the music playing relatively quietly.  In comparison, if I were to do
> that with 2.6.24.2, it would wake the neighbors.  In both cases,
> this is with the volume set in aumix to 100 in both left and right
> (the maximum values).
> 
>         I haven't attempted to look through kernel changes from
> 2.6.24.2 to 2.5.25-rc3 yet, although I expect to over the weekend if
> nobody beats me to it.
> 
> Adam Richter

	I want to add the results of a few simple tests:

	1. Reverting only linux-2.6.25-rc6/sound/pci/hda/hda_intel.c to the
	   2.6.24.2 version had no effect (sound was still very quiet).

	2. Reverting linux-2.6.25-rc6/sound/pci/hda/*.[ch] to their
	   2.6.24.2 versions worked (i.e., sound was lound again).

	3. Other quick attempts at reverting various subsets of
 	   linux/sound/pci/hda/*.[ch] have resulted only in compilation
	   errors.

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