Re: No sound from SB live!

[Takashi Iwai <tiwai@suse.de>]

At Sun, 19 Feb 2006 23:25:33 +0100,
Pavel Machek wrote:
> 
> On Ne 19-02-06 16:54:34, Lee Revell wrote:
> > On Sun, 2006-02-19 at 22:49 +0100, Pavel Machek wrote:
> > > Hi!
> > > 
> > > > > I run Ubuntu Breezy, which has:
> > > > > 
> > > > > alsa-utils = 1.0.9a-4ubuntu5 
> > > > 
> > > > The alsa-utils version should not matter, it's alsa-lib that must be
> > > > kept in sync with the ALSA version in the kernel.
> > > 
> > > I tried to play with mpg123 using OSS emulation, so that it does not
> > > have anything to do with ALSA. No luck. Trying aplay:
> > > 
> > > root@hobit:/dev/snd#  aplay
> > > /usr/share/xemacs21/xemacs-packages/etc/sounds/hammer.wav
> > > aplay: main:533: audio open error: No such file or directory
> > > 
> > > while stracing:
> > > 
> > > open("/dev/snd/pcmC0D0p", O_RDWR)       = -1 ENOENT (No such file or
> > > directory)
> > > close(3)                                = 0
> > > write(2, "aplay: main:533: ", 17aplay: main:533: )       = 17
> > > write(2, "audio open error: No such file o"..., 43audio open error: No
> > > such file or directory) = 43
> > > write(2, "\n", 1
> > > 
> > > ... but pcmC0D0p is not described in devices.txt...?
> > 
> > Hmm, that's a udev problem or something.  If you have a static dev the
> > snddevices script that comes with ALSA will create the device files.
> 
> I'm using static /dev... snddevices script indeed fixed that, but it
> still does not work. (Is earphone in green connector enough?)

Likely -EUDEV?

> Ouch and that device should be still listed in devices.txt, no?

The minor numbers can be assigned dyanmically if
CONFIG_SND_DYNAMIC_MINORS is set, so it may be even confusing to list
up there as if static only.


> root@hobit:/dev/snd#  aplay
> /usr/share/xemacs21/xemacs-packages/etc/sounds/hammer.wav
> Playing WAVE
> '/usr/share/xemacs21/xemacs-packages/etc/sounds/hammer.wav' : Unsigned
> 8 bit, Rate 8000 Hz, Mono
> root@hobit:/dev/snd#
> 
> Actually, in a quiet room I think I can hear *something*. Too faint to
> recognize :-(.

If you hear something, it's definitely a mixer configuration problem,
maybe screwed up by some reason.  In such a case, it's easier to
re-initialize from the scratch:

Unload the module first, then remove /etc/asound.state (or whatever
the distro uses) to prevent the automatic "alsactl restore".
Reload the module, then unmute/adjust the volume "PCM" and "Master".
The other volumes should have been initialized to be audible.


Takashi
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