Nux Mighty Plug USB - no clock source

[Takashi Iwai]

On Tue, 02 Feb 2021 19:52:57 +0100,
Peter Allen wrote:
> 
> Thank you for taking the time to look at this.
> I've tried your latest 5.12 branch, and sure enough it works perfectly without
> any problems. 
> So I'm really happy. Thank you!

Good to hear!


Takashi

> 
> Pete
> 
> On Mon, 1 Feb 2021, 14:24 Takashi Iwai, <tiwai at suse.de> wrote:
> 
>     On Sat, 30 Jan 2021 09:30:50 +0100,
>     Peter Allen wrote:
>     >
>     > I have a NUX Mighty Plug guitar effects which has a USB Audio interface.
>     > Unfortunately it doesn't work in Linux, and I'd love to fix it.
>     > It gets registered with Alsa, except it ends up without any valid sample
>     > rates (by the look of it due to a buggy clock source descriptor).
>     >
>     > This is on Ubuntu-Studio 20.04 LTS _Focal Fossa with kernel
>     > 5.4.0-62-lowlatency
>     > on a HP Omen 15 with i5-7300HQ
>     >
>     > I don't know what I'm doing (but did a little module development rather
>     a
>     > long time ago in the 2.2 days :-)) Help is  greatly appreciated.
>     >
>     > When plugged in I get:
>     > [12476.413792] usb 1-1: New USB device found, idVendor=1fc9,
>     > idProduct=8260, bcdDevice= 1.00
>     > [12476.413797] usb 1-1: New USB device strings: Mfr=1, Product=2,
>     > SerialNumber=3
>     > [12476.413800] usb 1-1: Product: MIGHTY PLUG USB
>     > [12476.413804] usb 1-1: Manufacturer: NUX
>     > [12476.413807] usb 1-1: SerialNumber: 2007151403
>     > [12476.444988] usb 1-1: __uac_clock_find_source(): selector reported
>     > illegal value, id 40, ret 0
>     > [12476.444992] usb 1-1: parse_audio_format_rates_v2v3(): unable to find
>     > clock source (clock -22)
>     > [12476.445413] usb 1-1: __uac_clock_find_source(): selector reported
>     > illegal value, id 40, ret 0
>     > [12476.445479] usb 1-1: __uac_clock_find_source(): selector reported
>     > illegal value, id 40, ret 0
>     > [12476.447095] usb 1-1: __uac_clock_find_source(): selector reported
>     > illegal value, id 40, ret 0
>     > [12476.447098] usb 1-1: parse_audio_format_rates_v2v3(): unable to find
>     > clock source (clock -22)
>     > [12476.447459] usb 1-1: __uac_clock_find_source(): selector reported
>     > illegal value, id 40, ret 0
>     > [12476.447684] usb 1-1: __uac_clock_find_source(): selector reported
>     > illegal value, id 40, ret 0
>     > [12476.450397] usbcore: registered new interface driver snd-usb-audio
>    
>     This might be covered by the recent fixes for 5.12 kernel, found in
>     for-next branch of my sound git tree.
>       git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git
>    
>     Also, as both playback and capture streams are ASYNC, those might be
>     supposed to be running in the implicit feedback.  With the very latest
>     kernel, this can be enabled via implicit_fb=1 module option.  If this
>     works better, we can set up a static quirk table entry for the device,
>     too.
> 
>     Takashi
> 
>