Problem with snd-usb-audio (usbmixer)

Problem with snd-usb-audio (usbmixer)

[Lonnie Mendez]

(See description below)

Specs:
linux kernel 2.6.8.1 (sound subsystem built-in, usb-audio module from USB
Support not compiled)
alsa-driver 1.0.6a (usb-audio module selected)

Problem occurs on:
uhci/ehci intel p3 abit bh6 and uhci intel p3 laptop

Relevant messages:

dmesg:
ALSA /work/alsa-driver-1.0.6a/usb/usbaudio.c:2573: 8:1:1: add audio endpoint
0x2

ALSA /work/alsa-driver-1.0.6a/usb/usbaudio.c:2573: 8:1:2: add audio endpoint
0x2

ALSA /work/alsa-driver-1.0.6a/alsa-kernel/usb/usbmixer.c:866: [3] FU [PCM
Playback Switch] ch = 1, val = 0/1/1

ALSA /work/alsa-driver-1.0.6a/alsa-kernel/usb/usbmixer.c:866: [3] FU [PCM
Playback Volume] ch = 2, val = -32768/0/256

ALSA /work/alsa-driver-1.0.6a/alsa-kernel/usb/usbmixer.c:313: cannot get ctl
value: req = 0x83, wValue = 0x200, wIndex = 0x300, type = 4

ALSA /work/alsa-driver-1.0.6a/alsa-kernel/usb/usbmixer.c:611: 3:0: cannot
get min/max values for control 2 (id 3)

ALSA /work/alsa-driver-1.0.6a/alsa-kernel/usb/usbmixer.c:866: [3] FU [PCM
Playback Volume] ch = 1, val = 0/1/1


/proc/asound

  devices:
0: [0- 0]: ctl

16: [0- 0]: digital audio playback

33: : timer

  cards:
0 [PCM2702 ]: USB-Audio - Burr-Brown Japan PCM2702

Burr-Brown Japan Burr-Brown Japan PCM2702 at usb-0000:00:0b.3-6.4, full
speed



alsamixer fails with:

alsamixer: function snd_mixer_load failed: Invalid argument

amixer fails with:

amixer: Mixer default load error: Invalid argument

alsasound script given command stop will yield these results:

Shutting down driver: /usr/sbin/alsactl: get_control:194: Cannot read
control '2,0,0,PCM Playback Volume,1': Invalid argument


You can view lsusb -vv output here:

http://geocities.com/i0xox0i/lsusboutput.txt

Every time I try loading the snd-usb-audio module usbmixer will fail to get
or set values.  I'm guessing this device is going to require a custom mixer
map to be created in usbmixer_maps.c?  How exactly should this be written
given the output from the lsusb in verbose mode?



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Re: Problem with snd-usb-audio (usbmixer)

[Lonnie Mendez]

----- Original Message ----- 
From: "Matt Flax" <flatmax@Matt.Flax>
To: "Lonnie Mendez" <lmendez19@austin.rr.com>
Sent: Wednesday, August 18, 2004 2:26 AM
Subject: Re: [Alsa-devel] Problem with snd-usb-audio (usbmixer)


> What hardware are you trying to use specificly ?

USB-Audio - Burr-Brown Japan PCM2702

    It is pretty much a usb speaker application, which transmitts on
specific fm frequences.  LineX sells these units.  I know it works, as I've
used it standalone with the linux kernel usb audio driver for usb-audio
speakers and other devices... I'm trying to have it run from the alsa
snd-usb-audio driver now.  I've had some luck with configuring a mixer map
for it, if I add entries for VID/PID and set the "ignore get/set error"
variable to 1... however no dsp device seems to exist so I can not test my
progress.  I'm guessing this is going to require not only the custom mixer
map, but an entry in the usbquirks file.  If you need more information from
me, please refer to the info provided in my last few messages... there
should be more than enough to diagnose this one.


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Re: Problem with snd-usb-audio (usbmixer)

[Lonnie Mendez]

> What I was trying to get info about was wether it has a soft mixer or 
> only hard mixer ... my M-Audio USB card for example only has a hardware 
> mixer (knobs).

The device has no physical controls on it.

http://geocities.com/i0xox0i/lsusboutput.txt



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