Failed to open Alsa device "hw:1,0" no such file or directory

[TheOldPresbyope]

@Deenoo

Interesting problem.

I have three USB audio devices


- an old C-Media CM108 USB to headphone adapter (e.g., 3.5mm analog audio out)
- a Creative Technology W2 USB-BT audio adapter
- a Khadas Tone Board

The USB device-tree information returned for these three by lsusb -v differs in details but in every case includes an interface class "Audio"

Code:

# In each case, I found the -d vendor:device codes by running lsusb without options
pi@moode3a:~ $ sudo lsusb -v -d 041e:3125|grep Audio
  iProduct                2 Creative Bluetooth Audio W2
      bInterfaceClass         1 Audio
...

pi@moode4b:~ $ lsusb -v -d 0d8c:013c|grep Audio
Couldn't open device, some information will be missing
Bus 001 Device 003: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller
 idProduct          0x013c CM108 Audio Controller
     bInterfaceClass         1 Audio
...

# the iProduct string for the Khadas, not seen here, occurs later in the output
pi@moodelr:~ $ lsusb -v -d 20b1:000a|grep Audio
Couldn't open device, some information will be missing  ### can be ignored for this test
      bFunctionClass          1 Audio
      bInterfaceClass         1 Audio
...

More fundamentally, each of these devices was detected by the kernel as an audio device. For example, in the case of the Khadas Tone Board

Code:

pi@moodelr:~ $ dmesg|grep usb
... skipping all the lines about other USB devices detected
[    1.591733] usb 1-1.4: new high-speed USB device number 4 using xhci_hcd
[    1.722664] usb 1-1.4: New USB device found, idVendor=20b1, idProduct=000a, bcdDevice= 1.04
[    1.722708] usb 1-1.4: New USB device strings: Mfr=1, Product=3, SerialNumber=0
[    1.722741] usb 1-1.4: Product: Khadas Tone Control
[    1.722766] usb 1-1.4: Manufacturer: XMOS
[    5.722687] usbcore: registered new interface driver brcmfmac
[    5.848004] usb 1-1.4: 1:3 : unsupported format bits 0x100000000
[    5.853859] usbcore: registered new interface driver snd-usb-audio

If you don't see that last line then the Linux kernel isn't recognizing your Playmate. That's something for Burson to work out with the Linux developers.

Regards,
Kent