Hello ALSA users,
I am having trouble with getting sound out of a built-in DAC in my Matrix M-Stage HPA-1 (USB) (http://www.matrix-digi.com/en/products/8/index.html) The analog amplifier part of this device works well, but I am unable to make the USB DAC work.
The device identifies as:
$ lsusb
Bus 003 Device 002: ID 04d8:feea Microchip Technology, Inc.
$ aplay -l
card 1: AUDIO [MATRIX AUDIO], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
$ cat /proc/asound/card1/stream0
Texas Instruments MATRIX AUDIO at usb-0000:03:00.0-1, full speed : USB Audio
Playback:
Status: Stop
Interface 1
Altset 1
Format: S24_3LE
Channels: 2
Endpoint: 1 OUT (ADAPTIVE)
Rates: 44100, 48000, 88200, 96000
Outputs from aplay -L and lsusb -v are attached.
The problem is that I can not get any sound, not even bad quality / cracking / noise from this device when its input source is set to the DAC. And there is not much error or warning messages anywhere that I have looked (dmesg, /var/log/syslog, /var/log/kern.log). Everything seems to be working perfectly (except for one unclear message in the log - described below). Yet, I still get no sound.
I am using the newest Ubuntu and I have tried to use aplay to debug what is going on. I have done:
# echo 1 > /proc/asound/card1/pcm0p/xrun_debug
and then
$ aplay -D hw:1 sample.wav
Playing WAVE 'sample.wav' : Signed 24 bit Little Endian in 3bytes, Rate 44100 Hz, Stereo
$ aplay -D hw:1 sample2.wav
Playing WAVE 'sample2.wav' : Signed 24 bit Little Endian in 3bytes, Rate 96000 Hz, Stereo
Both files simply played... but there was this line in /var/log/syslog:
kernel: [ 7067.190242] 2:1:1: cannot get freq at ep 0x1
It appeared every time I have started the playback, but the file just kept playing. There were no errors from aplay and no more error messages in syslog, but no sound as well.
Then I have tried a different sample format, just to check what the device will do if it is supplied with audio in a format it does not understand.
$ aplay -D hw:1 sample3.wav
Playing WAVE 'sample3.wav' : Signed 32 bit Little Endian, Rate 44100 Hz, Stereo
aplay: set_params:1233: Sample format non available
Available formats:
- S24_3LE
That was expected, because this DAC only supports the above mentioned sample format. However, I would expect aplay to try and convert sample formats by default ... Anyway ... that does not matter here.
What matters is that I do not know what to do next. From the software point of view, almost everything seems to be working perfectly. But there is no sound, ... so something must be wrong.
I have been thinking about debugging the usb communication somehow. It would be worth trying to set various parameters / frame sizes / timings / etc ... and see what has changed ... But I do not know much about that - I do not even know where to start. So, I have decided to try to ask here.
Can anyone provide some advice / guidance on how to debug this issue?
Thank you very much in advance!
Sincerely
Peter Basista
Attachment:
lsusb-v
Description: Binary data
Attachment:
aplay-L
Description: Binary data
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