Hello all,
I am having issues with a special USB composite audio device, having 3
audio devices with the same VID/PID using multiple interfaces.
The first device has one mono output, the second also, and the third has
one input, and one output channels.
The device works fine using a debian-based distro, with the kernel version
3.16 and 4.1.25 , and the corresponding alsa (and also on winXP and W7).
However using the kernel version 4.4.1 the third device is not working:
alsa identifies the input and output channles (e.g. aplay/arecord -l),
but if I try to capture stream with arecord (or any other sw) get an error
message: "arecord: main:722: audio open error: No such file or directory".
I collected some analysis information with alsa-info.sh using the 4.1.25
and 4.4.1, using the same HW (PC), the device is connected to the same USB
ports - attached.
What it can be clearly seen, that (in the arecord section) the
bidirectional device is the device2 in the good case, but it is the device0
using the newer kernel/alsa.
I am not sure, whether this is a reason or an effect?
In the good case:
card 5: Module [Spc Module], device 2: USB Audio [USB Audio #2]
Subdevices: 1/1
Subdevice #0: subdevice #0
and in the bad case:
card 5: Module [Spc Module], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
Could please somebody help in the analysis, how to proceed.
Thanks
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