[Alsa-user] USB audio on riscv64

[Takashi Iwai]

On Thu, 04 Nov 2021 22:37:26 +0100,
Kip Warner wrote:
> 
> On Thu, 2021-11-04 at 08:40 +0000, Dmitri Seletski wrote:
> > I am just a user.
> > Can't help but wonder if usb snd modules were compiled in or loaded?
> 
> Hey Dmitri,
> 
> CC'ing the lists. When I plug in the device, I see the following on the
> bus:
> 
>    $ lsusb
>    ...
>    Bus 001 Device 003: ID 1908:2070 GEMBIRD Honk HK-5002 USB Speaker
>    ...
> 
> The kernel logs the following in kern.log:
> 
>    [  291.681086] usb 1-2.3: new full-speed USB device number 3 using xhci_hcd
>    [  291.850299] usb 1-2.3: New USB device found, idVendor=1908, idProduct=2070, bcdDevice= 1.00
>    [  291.850333] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
>    [  291.850345] usb 1-2.3: Product: USB2.0 Device
>    [  291.850355] usb 1-2.3: Manufacturer: Generic
>    [  291.850365] usb 1-2.3: SerialNumber: 20130100ph0
>    [  292.434209] mc: Linux media interface: v0.10
>    [  292.734949] usb 1-2.3: 1:1: cannot get freq at ep 0x2
>    [  292.802612] usb 1-2.3: 2:0: bogus dB values (-12800/-12700), disabling dB reporting
>    [  292.803733] usbcore: registered new interface driver snd-usb-audio
> 
> The device still doesn't appear to be visible to ALSA:
> 
>    $ aplay -l
>    aplay: device_list:276: no soundcards found...

Check the contents in /proc/asound/cards.  Is that empty as well?

If the card is recognized there, check the /sys/class/sound/*.
If a PCM device is found there, it must be the lack of the
corresponding device in /dev/snd/* that is usually created via udev.


Takashi