linux-kernel - Re: [Bug #10679] 2.6.26-rc1 regression: e5e1d3cb20034a3cbcfff1f0bae12201aa2ce17e breaks artsd

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Date:	Thu, 15 May 2008 18:36:29 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Theodore Tso <tytso@....edu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Roberto Oppedisano <roberto.oppedisano@...racom.it>,
	Stas Sergeev <stsp@...et.ru>
Subject: Re: [Bug #10679] 2.6.26-rc1 regression:	e5e1d3cb20034a3cbcfff1f0bae12201aa2ce17e breaks artsd

At Thu, 15 May 2008 09:06:54 -0400,
Theodore Tso wrote:
> 
> On Thu, May 15, 2008 at 07:41:06AM +0200, Takashi Iwai wrote:
> > Sounds reasonable.  To where should it be added, BTW?
> > Little people seem to care about Kconfig help texts, and an extra
> > comment block (with depends on SND_PCSP) could be annoying...
> 
> That's a good question.  A note that including including this module
> could potentially cause sound cards to be renumbered might be
> reasonable, since I suspect most users (and most application
> programs!) have been accustomed to only having one sound card, and so
> building this module may cause sound cards to be renumbered in Kconfig
> would at least be a start.

Yes.

> I know this wouldn't help users of distro kernels, but this would at
> least be one way of warning distro maintainers to think twice about
> enabling it as a module.

Well, yeah, for distro kernels, it's then a problem of distributors :)

>  BTW, what *is* the utility of this card, and
> how do you use it?  I haven't been able to figure out how to use it do
> anything entertaining at all.  Any attempts to use it on my system
> just lead to various confusing error messages.

It looks like a problem in the recent alsa-lib.  This driver works
fine without dmix, e.g. "aplay -Dplughw:1 foo.wav" works.
I'll investigate later.

> Also, BTW, it might be nice to remove the following hunk of text from
> drivers/sound/Kconfig:
> 
> 	I'm told that even without a sound card, you can make your computer
> 	say more than an occasional beep, by programming the PC speaker.
> 	Kernel patches and supporting utilities to do that are in the pcsp
> 	package, available at <ftp://ftp.infradead.org/pub/pcsp/>.
> 
> What's there at the above URL is for the 2.2 and 2.4 kernels, and the
> utilities at pcsnd-kit.tar.gz don't work (and didn't compile until I
> futzed with them slightly).

OK, I'll clean it up, too.

> So I'm still rather puzzled how to make the snd-pcsp actually do
> anything useful, unless it simply doesn't work on my Thinkpad.  (Is it
> normal that the sound volume levels reported by alsamixer can be muted
> or unmounted, but always report 0, and can't be adjusted up?)

It can be adjusted via alsa-lib softvol plugin.  That is, the volume
attenuation is done in the user-space, not in the driver.


thanks,

Takashi
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