#678: Trust USB Audio - incorrect config when plugged in
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Reporter: Tweenk | Owner: lennart
Type: defect | Status: new
Milestone: | Component: daemon
Resolution: | Keywords:
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Comment(by tanuk):
Replying to [comment:3 Tweenk]:
> The attached file is a log of pulseaudio -vvvv. At line 979 I plug in
the Trust USB Audio card.
Lines 1060-1080:
{{{
D: alsa-mixer.c: Looking at profile output:analog-stereo
D: alsa-mixer.c: Checking for playback on Analog Stereo (analog-stereo)
D: alsa-util.c: Trying front:1 with SND_PCM_NO_AUTO_FORMAT ...
I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-
Audio.pcm.front.0:CARD=1'
I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file
or directory
I: (alsa-lib)conf.c: Evaluate error: No such file or directory
I: (alsa-lib)pcm.c: Unknown PCM front:1
I: alsa-util.c: Error opening PCM device front:1: No such file or
directory
D: alsa-util.c: Trying hw:1 with SND_PCM_NO_AUTO_FORMAT ...
D: alsa-util.c: Managed to open hw:1
D: alsa-util.c: snd_pcm_hw_params_set_channels(2) failed: Invalid argument
D: alsa-util.c: Trying hw:1 without SND_PCM_NO_AUTO_FORMAT ...
D: alsa-util.c: Managed to open hw:1
D: alsa-util.c: snd_pcm_hw_params_set_channels(2) failed: Invalid argument
D: alsa-util.c: Trying plug:hw:1 with SND_PCM_NO_AUTO_FORMAT ...
D: alsa-util.c: Managed to open plug:hw:1
D: alsa-util.c: snd_pcm_hw_params_set_channels(2) failed: Invalid argument
D: alsa-util.c: Trying plug:hw:1 without SND_PCM_NO_AUTO_FORMAT ...
D: alsa-util.c: Managed to open plug:hw:1
D: alsa-util.c: snd_pcm_hw_params_set_channels(2) failed: Invalid argument
I: alsa-util.c: Failed to set hardware parameters on plug:hw:1: Invalid
argument
}}}
The alsa driver is broken: it doesn't provide the "front" device. In case
of stereo output, Pulseaudio tries "hw" and "plug:hw" as fallbacks, but
they don't work either, because snd_pcm_hw_params_set_channels() fails.
This is presumably a driver bug too.
Since you mentioned 7.1 surround output, here are the lines 1325-1330:
{{{
D: alsa-mixer.c: Looking at profile output:analog-surround-71
D: alsa-mixer.c: Checking for playback on Analog Surround 7.1 (analog-
surround-71)
D: alsa-util.c: Trying surround71:1 with SND_PCM_NO_AUTO_FORMAT ...
I: (alsa-lib)conf.c: Unknown parameters 1
I: (alsa-lib)pcm.c: Unknown PCM surround71:1
I: alsa-util.c: Error opening PCM device surround71:1: Invalid argument
}}}
It seems that the driver provides the "surround71" device as it should,
but it doesn't handle the card index parameter. Again, this is a bug in
the alsa driver as far as I can tell.
--
Ticket URL: <http://pulseaudio.org/ticket/678#comment:4>
PulseAudio <http://pulseaudio.org/>
The PulseAudio Sound Server
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