TRX40 Realtek ALC1220-VB USB Audio

[Takashi Iwai]

On Sat, 07 Mar 2020 14:00:26 +0100,
laurent Trinques wrote:
> 
> Hello,
> 
> sudo dmesg -lerr -lcrit
>  
> [    0.386478] ACPI BIOS Error (bug): Failure creating named object 
> [\_SB.I2CA.WT1A], AE_ALREADY_EXISTS (20191018/dswload2-323)
(snip)
> [    2.545332] Error: Driver 'pcspkr' is already registered, aborting...

All those are irrelevant with the sound problem.

> [    2.572542] snd_hda_intel 0000:23:00.4: no codecs found!

I guess this is a known "problem", the strange hardware implementation
where exposing the dummy HD-audio bus with non-existing codec.  So
this can be ignored as well (maybe we can blacklist the PCI ID for
ignoring more properly).

The real issue is:
> [    8.169209] usb 7-5: cannot get ctl value: req = 0x83, wValue = 0xc00, 
> wIndex = 0x1300, type = 4
> [    8.169214] usb 7-5: 19:0: cannot get min/max values for control 12 (id 19)

So it's likely a USB audio firmware that doesn't behave correctly as
advertised, and we'd need a workaround.

Could you give lsusb -v output for this device?


Takashi