Re: Steinberg UR22 Crackling and Clicks

[Takashi Iwai <tiwai@suse.de>]

On Wed, 09 Dec 2020 17:07:53 +0100,
Kilian wrote:
> 
> >> > Then try to pass implicit_fb=1 option to snd-usb-audio module.
> >> > It's a new option that was added recently.
> >> >
> >> >
> >> > Takashi
> >>
> >> Nice, that did the trick. there was a small glitch on first playback
> >> but I can not reproduce it now. Playback seems glitch-free now. I will
> >> test it with pulseaudio in the gui if I can. It's not quite easy to
> >> test, because the system locks up after a while with the new kernel
> >> and gnome 3. I will also test concurrent playback and recording,
> >> too. Thank you very much, that was a huge help!
> >
> > Good to hear.  If the implicit_fb option works, we can add a static
> > quirk table entry easily.  Just add IMPLICIT_FB_GENERIC_DEV() with the
> > device ID to playback_implicit_fb_quirks[] table in
> > sound/usb/implicit.c.
> >
> >
> > Takashi
> 
> Still having problems with the nouveau driver, so i couldn't thest
> this with pulseaudio. Recording with arecord works parallel to playing
> back with aplay. so here is my patch for implicit.c

OK, I'll cook up the proper patch and submit for 5.11 merge.


thanks,

Takashi

> diff --git a/sound/usb/implicit.c b/sound/usb/implicit.c
> index 386198b36b87..c729ff634b9d 100644
> --- a/sound/usb/implicit.c
> +++ b/sound/usb/implicit.c
> @@ -46,6 +46,7 @@ static const struct snd_usb_implicit_fb_match
> playback_implicit_fb_quirks[] = {
>         IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2081), /* M-Audio FastTrack
> Ultra */
>         IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2030), /* M-Audio Fast Track
> C400 */
>         IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2031), /* M-Audio Fast Track
> C600 */
> +       IMPLICIT_FB_GENERIC_DEV(0x0499, 0x1509), /* Steinberg UR22 */
> 
>         /* Fixed EP */
>         /* FIXME: check the availability of generic matching */
>