[gentoo-user] Problems with USB sound (Creative MP3+)

[Artjom Simon]

Hi everyone,

ok, I'm trying to get sound out of my Creative SoundBlaster MP3+ (external,
USB).

So far, all the logs show me that it's being recognized by snd-usb-audio, at
least:

--
# lsusb:
...
Bus 001 Device 003: ID 041e:3010 Creative Technology, Ltd
Bus 001 Device 002: ID 0409:0059 NEC Corp. HighSpeed Hub
...

# cat /proc/asound/card0/stream0

Creative Labs Sound Blaster MP3+ at usb-:00:1d.7-3.1, full speed : USB
Audio

Playback:
  Status: Stop
  Interface 1
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 1 OUT (ADAPTIVE)
Rates: 48000

Capture:
  Status: Stop
  Interface 2
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 2 IN (ASYNC)
Rates: 48000, 44100

# cat /etc/modules.conf

...
alias char-major-116 snd
alias char-major-14 soundcore

alias snd-card-0 snd-usb-audio

alias sound-slot-0 snd-card-0

alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss

alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss
...
--

All volume settings were demuted and set to max using alsamixer or kmix.


- using kernel 2.6.10:

When I try to play something in xmms or bmp, the time label gets frozen,
and I don't hear anything (the GUI doesn't freeze, though).

Instead, this is what i get in a console:

 ** WARNING **: alsa_free(): snd_pcm_start() failed: Broken pipe

This message is outputted infinitely until I kill -9 the player.

Meanwhile, the same happens in the kernel log with the following message:

 cannot submit datapipe for urb 0, err = -38

This is also being outputted infinitely.


- using kernel 2.6.11-rc1-mm1

After upgrading, I surprisingly do hear sound, however it's overlayed with
a kind of choppy noise: 3 x pop, pause, 3x pop, pause, ... this
scheme loops approx. 3x/sec. 

I've already tried using mmap mode and/or software mixing and playing with
aplay or mplayer.
Nothing helps.

Any ideas?

Thanks,
Artjom

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Re: [gentoo-user] Problems with USB sound (Creative MP3+)

[Christoph Eckert]

 All volume settings were demuted and set to max using
 alsamixer or kmix.


 - using kernel 2.6.10:

your card is marked as supported on the ALSA soundcard matrix.

I also have an USB-audio-device and it works really great.

I'd try to do a

modprobe snd-usb-audio

Then I'd try a

cat /proc/asound/cards

I guess there's an internal soundchip (like AC97), so your USB 
card is now the second one. If so, try

alsamixer -c 0
alsamixer -c 1
alsamixer -c 2

Furthermore, try to disable all OSS stuff in your kernel. I 
had lots of problems because I had some OSS modules on my 
machine. Please note that the OSS-USB-modules are found in 
the dirver's usb section, not in the sound section.



 Best regards


ce

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