Hi Stu,
it looks like Alsa is having trouble retrieving mixer control information
from the device,
or a quirk is missing, or something like that.
Recent kernels have a new usb_audio_dbg() feature that dynamically enable
printing of debug information for usb audio.
If you kernel was compiled with DEBUG, this information should be logged in
messages or kern.log
Otherwise you need to recompile with this option or with DYNAMIC_DEBUG
option,
and then activate debug traces for the mixer using the command:
* echo "file mixer.c" > /sys/kernel/debug/dynamic_debug/control *
Activating traces for any file located under "sound/usb/" could also be
useful.
Then, plug your card, try to aplay and amixer, and let us know what comes
out.
Hope this helps,
Sam
2015-06-24 13:20 GMT+02:00 noblesavage114 <stusmi...@hotmail.com>:
> Have made a 48K 16bit wav file for testing and get error msg:
>
> stu@Server:~$ sudo aplay -D plughw:1,0 /media/Disk2/Rehab.wav
> Playing WAVE '/media/Disk2/Rehab.wav' : Signed 16 bit Little Endian, Rate
> 48000 Hz, Stereo
> aplay: set_params:1297: Unable to install hw params:
> ACCESS: RW_INTERLEAVED
> FORMAT: S16_LE
> SUBFORMAT: STD
> SAMPLE_BITS: 16
> FRAME_BITS: 32
> CHANNELS: 2
> RATE: 48000
> PERIOD_TIME: 125000
> PERIOD_SIZE: 6000
> PERIOD_BYTES: 24000
> PERIODS: 4
> BUFFER_TIME: 500000
> BUFFER_SIZE: 24000
> BUFFER_BYTES: 96000
> TICK_TIME: 0
>
> alsamixer gives error when I try to select xmos:
>
> cannot load mixer controls: Protocol error
>
>
> The output from the alsa info script is here:
>
> http://www.alsa-project.org/db/?f=fbc3b0551ec41aa0398a12bee53056a1acfafe32
>
>
>
> lsusb -v - is available at:
>
> http://www.justvape.co.uk/LSUSB.htm
>
> Have spent a weekend on this before I called for help, any advice would be
> great - specifically if this xmos board will not work then I will know - it
> works under windows fine.
>
> It is the 10pin U8 xmos daughter board for chinese AK4399 dac also for the
> ES9018 Dac i Believe
>
> Stu
>
>
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