[PATCH] ALSA: usb-audio: Apply implicit feedback mode for BOSS devices

[Lucas]

Keith, if it's anything like the Roland devices I've tested with this
long-awaited patch, could you show the JS-8's "lsusb -v"?

For me, silence due to the wrong line takes the form of unheard output
playback, while still working for input capture, so I'm not sure this has
any bearing on your issue.

Takashi Iwai has indicated a likely connection between needing the
IMPLICIT_FB_BOTH_DEVICE line if there's "Asynchronous" "Synch Type" for
both input and output endpoints.  Otherwise, possibly, it should be
reverted to IMPLICIT_FB_FIXED_DEVICE for the JS-8.

I did check my Roland devices with jack, but only after they were all
working with standard arecord and aplay.

Thanks,

  Lucas

On Mon, Apr 19, 2021 at 9:13 AM Keith A. Milner <maillist at superlative.org>
wrote:

> On Wednesday, 14 April 2021 16:08:54 BST Mike Oliphant wrote:
> > Thanks for your help with this, Takashi.
> >
> > I have tested this patch on BOSS GT-1 and BOSS Katana, so we have a
> fairly
> > high degree of confidence that it will work on the other BOSS devices.
> >
> > It may well help with other similar Roland devices. If your device has
> > playback working, but with occasional pops/clicks in the audio stream, it
> > is worth trying to add the IMPLICIT_FB_BOTH_DEV quirk for the device.
> >
>
> I have confirmed that it works with the GT-1 and Boss Katana as well.
>
> I have also tested with the Boss BR-80 and GT-001 and this still seems to
> work
> well for me, so no obvious issues have arisen from making this change.
>
> I did also try the Boss JS-8. This works in Ardour, but capture from
> command
> line using arecord results in a file of silence. I'll do some more digging
> into
> this one.
>
> Regards,
>
> Keith
>
>
>
>
>