Bug with USB Audio sound card (alsa-info provided)

[Nicholas Kreimeyer <keridos@protonmail.com>]

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Hello dear Alsa devs,

I have an Arylic B50 SE USB (and BT) Audio interface for driving my 
speakers.
It works fine except that the volume control seems to be bugged.
With alsamixer I can set the volume of the device from 0-100 but the 
master level (when its main device) only changes from 50-100. All values 
below 50 are completely silent.

I have provided alsa-info about my system here: 
https://alsa-project.org/db/?f=df0b4e88103e32de5be947419e734ba2ce55af1b
The USB sound card is ID 3 "Arylic Up2Stream USB Audio at 
usb-0000:10:00.0-6, full speed"

Dmesg output when connecting the device:
[  689.758406] usb 1-6: new full-speed USB device number 16 using xhci_hcd
[  690.028312] usb 1-6: not running at top speed; connect to a high 
speed hub
[  690.048287] usb 1-6: New USB device found, idVendor=8888, 
idProduct=1717, bcdDevice= 1.00
[  690.048290] usb 1-6: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[  690.048292] usb 1-6: Product: Up2Stream USB Audio
[  690.048293] usb 1-6: Manufacturer: Arylic
[  690.048294] usb 1-6: SerialNumber: 20190808
[  690.132014] usb 1-6: Warning! Unlikely big volume range (=4096), 
cval->res is probably wrong.
[  690.132018] usb 1-6: [2] FU [PCM Playback Volume] ch = 2, val = 0/4096/1
[  690.141210] input: Arylic Up2Stream USB Audio as 
/devices/pci0000:00/0000:00:02.1/0000:05:00.0/0000:06:08.0/0000:08:00.0/0000:09:0c.0/0000:10:00.0/usb1/1-6/1-6:1.2/0003:8888:1717.0013/input/input33
[  690.191459] hid-generic 0003:8888:1717.0013: input,hidraw13: USB HID 
v2.01 Device [Arylic Up2Stream USB Audio] on usb-0000:10:00.0-6/input2
[  690.191615] usbhid 1-6:1.3: couldn't find an input interrupt endpoint



If possible, can that bug with the volume controls be fixed?
If it is a rather easy fix I can probably code it myself if given a few 
pointers of where to start.

If you need additional info from me, please don't hesitate to ask.


Thank you for your work on ALSA and with regards
Nico Kreimeyer


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