[alsa-devel] USB speaker with CM103+ chip has left and right audio inverted

[Helge Deller]

Hello,

When using my Logitech LogiLink USB Speaker with Linux, the left and right audio channel is inverted.

lsusb shows
Bus 001 Device 016: ID 0d8c:0104 C-Media Electronics, Inc. CM103+ Audio Controller

dmesg gives:
kernel: usb 1-3: new full-speed USB device number 16 using xhci_hcd
kernel: usb 1-3: New USB device found, idVendor=0d8c, idProduct=0104, bcdDevice= 0.10
kernel: usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
kernel: usb 1-3: Product: USB Sound Device
kernel: usb 1-3: Manufacturer: C-Media INC.
kernel: usb 1-3: Warning! Unlikely big volume range (=9472), cval->res is probably wrong.
kernel: usb 1-3: [13] FU [PCM Playback Volume] ch = 2, val = -9473/-1/1
kernel: input: C-Media INC. USB Sound Device         as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.2/0003:0D8C:0104.0034/input/input59
kernel: hid-generic 0003:0D8C:0104.0034: input,hidraw4: USB HID v1.00 Device [C-Media INC. USB Sound Device        ] on usb-0000:00:14.0-3/input2

Is there a quirk possible?
Any idea/patch what I could test?

This is on Fedora29 with kernel 4.19.5-300.fc29.x86_64.

Thanks,
Helge