[PATCH] ALSA: usb-audio: Fix regression with Dell Dock jack detection

[Takashi Iwai]

On Wed, 02 Nov 2022 12:53:48 +0100,
Jaroslav Kysela wrote:
> 
> On 02. 11. 22 12:34, Takashi Iwai wrote:
> > The recent commit added Jack controls to Dell Dock, but it added with
> > iface = SNDRV_CTL_ELEM_IFACE_CARD.  Unfortunately this doesn't match
> > with the changes in user-space UCM profile, which expects iface =
> > SNDRV_CTL_ELEM_IFACE_MIXER as default.  This mismatch resulted in the
> > non-working profile, and the Dell Dock is gone on pipewire /
> > PulseAudio after the kernel update.
> > 
> > Fix the regression by adjusting the iface of the new ctl elements to
> > *_MIXER.
> 
> Hi Takashi,
> 
> UCM expects SNDRV_CTL_ELEM_IFACE_CARD for jacks by default. Which
> change do you refer? I would drop this patch.

It's about ucm2/USB-Audio/Dell/WD15-Dock-HiFi.conf, the JackControl
entries.  For example,
		JackControl "Headphone Jack"
expects the mixer element.  The bad thing is that the complete card
entry disappears because of inconsistency.
If you modify the entry as
		JackControl "name='Headphone Jack',iface=CARD"
it would work.  But the fact that other JackControl stuff works, it's
better to align the USB-audio with IFACE_MIXER, I guess.


Takashi