PCM.rear missing

[Schneider, Thomas]

Hi,

 

I recently switched from Debian Etch to Debian Lenny, and just recognized that some of the pcm-devices I was using earlier are missing in the new version.

With Debian Etch I could use the "front" and "rear" Device independent, also from within OpenAL-soft. With debian etch the "rear" device is no more available..

 

Does anyone know the reason for this?

 

Best regards

Thomas

 

 

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[Chris Robinson-5]

On Tuesday 03 November 2009 6:19:52 am Schneider, Thomas wrote:
> I recently switched from Debian Etch to Debian Lenny, and just
> recognized that some of the pcm-devices I was using earlier are missing
> in the new version.
> With Debian Etch I could use the "front" and "rear" Device independent,
> also from within OpenAL-soft. With debian etch the "rear" device is no
> more available..
>
> Does anyone know the reason for this?

Hi.

How were you selecting the devices? OpenAL Soft should only enumerate the
available hw:x,y devices, as well as the 'default' device, from ALSA. The
"front" and "rear" plug devices shouldn't have been listed.

Semi-recent versions of OpenAL Soft changed it so the separate hardware
devices will only be listed with the ALC_ENUMERATE_ALL_EXT extension, though
the device-specific strings will still work as long as the app passes them
through (use the openal-info utility to see what OpenAL Soft will recognize).
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[Schneider, Thomas]

Hi Chris,

 

thanks for your response.

 

I don't think it's an OpenAL-Problem, because I don't have the devices any more, also when using aplay / speaker-test etc,

but since here are lots of sound specialists in the mailing list, I thought I could get help here.

 

Yesterday I recognized it's not just PCM.rear missing, but also the rear speakers also don't play any sound in surround-Mode.

To be application-independent I tried this with following command ( trying surround40 surround51,surround71, ...):

 

speaker-test -c 4 -twav -Dplug:surround40

 

on my new Shuttle SX58H7.

First try was with Debian Lenny, second try with a Live Ubuntu 9.10 ,

I have problems with both, I only get sound out of the front speakers ( telling "front-left" and "front-right" in the speaker-test example)

 

It's not a problem of the speakers. Parallel to my new Shuttle SX58H7, I also have a Shuttle SP35P2 ( with installed Debian Etch)

where I can get surround Sound ( and also have the PCM.rear listed when calling "aplay -L"

 

Does anyone have the same problems with surround sound on new linuxes?

 

Best regards

Thomas

 

 

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[Chris Robinson-5]

On Tuesday 03 November 2009 11:44:39 pm Schneider, Thomas wrote:

> Yesterday I recognized it's not just PCM.rear missing, but also the rear
> speakers also don't play any sound in surround-Mode.
> To be application-independent I tried this with following command (
> trying surround40 surround51,surround71, ...):
>
> speaker-test -c 4 -twav -Dplug:surround40
>
> on my new Shuttle SX58H7.
> First try was with Debian Lenny, second try with a Live Ubuntu 9.10 ,
> I have problems with both, I only get sound out of the front speakers (
> telling "front-left" and "front-right" in the speaker-test example)
>
> It's not a problem of the speakers. Parallel to my new Shuttle SX58H7, I
> also have a Shuttle SP35P2 ( with installed Debian Etch)
> where I can get surround Sound ( and also have the PCM.rear listed when
> calling "aplay -L"

Sounds like a driver problem, to me. Check alsamixer and see if there's any
rear or surround channels. If they're there, make sure the volume is up and
unmuted. If PulseAudio is installed, you might need to check through it for
the volume controls.

You'd probably have better luck asking in ALSA-related forums and such,
though.
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[Schneider, Thomas]

Hi Chris,

 

sorry, I mixed up 2 problems I had ( and have now resolved ).

 

First Problem: No Surround Sound on the Onboard Soundcard of the Shuttle SX58H7

 * Driver Problem. Driver ( alsa 1.0.21 ) only supports stereo at the moment

 

Second Problem: No pcm.rear - Device:

 * In earlier linux ( or alsa) - Distributions, there was a default rear - device for every sound-card ( listed when calling "aplay -L" )

 * In newer versions it doesn't exist any more, but with some ALSA-configuration knowledge one could build it himself.

 

Best regards

Thomas

 

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