[alsa-devel] Headphones not detected when using Dell Dock WD15

[Takashi Iwai]

On Fri, 12 May 2017 13:39:43 +0200,
Tanu Kaskinen wrote:
> 
> On Tue, 2017-05-09 at 11:00 +0200, Takashi Iwai wrote:
> > On Tue, 09 May 2017 10:52:56 +0200,
> > Sergio Villar Senin wrote:
> > > 
> > > O Mar, 09-05-2017 ás 10:37 +0200, Takashi Iwai escribiu:
> > > > On Tue, 09 May 2017 10:32:19 +0200,
> > > > Sergio Villar Senin wrote:
> > > > > 
> > > > > O Mar, 09-05-2017 ás 08:15 +0200, Takashi Iwai escribiu:
> > > > > > On Mon, 08 May 2017 11:34:33 +0200,
> > > > > > Sergio Villar Senin wrote:
> > > > > > > 
> > > > > > > Hi,
> > > > > > > 
> > > > > > > I reported this bug to pulseaudio[1] but after some
> > > > > > > investigation
> > > > > > > it
> > > > > > > looks like the alsa mixer is not working for the dock.
> > > > > > > 
> > > > > > > I'll be happy to provide any additional info which might be
> > > > > > > required
> > > > > > > (attaching alsa-info.sh BTW). Please add me to the Cc as I am
> > > > > > > not
> > > > > > > subscribed to this list
> > > > > > 
> > > > > > Did you try to update the dock BIOS?
> > > > > > The old BIOS on some Dell docks had a few known issues.
> > > > > 
> > > > > I tried with a virtual machine but the firmware update program
> > > > > crashes
> > > > > for some reason. Anyway the dock seems to be working fine because
> > > > > the
> > > > > Windows virtual machine properly detects the headphones when
> > > > > plugged
> > > > > in.
> > > > 
> > > > Well, it's a USB-audio device and it doesn't give the jack detection
> > > > control like HD-audio.
> > > 
> > > Not sure about the next step. Do you need additional information to
> > > solve the issue? Are you saying that it's a HW issue and that alsa is
> > > not going to provide any fix? I'm a bit confused.
> > 
> > In general Linux USB-audio driver doesn't provide the jack detection
> > control.  If any, it's vendor-specific.
> 
> The problem is not just that jack detection doesn't work, the problem
> is that the mixer doesn't work at all:
> 
> $ amixer -c1
> amixer: Mixer hw:1 load error: Invalid argument

Did you try to upgrade the firmware?  At least that kind of error
could be solved by the newer firmware.

> I would expect the USB-audio driver to provide a mixer control for
> choosing the routing, unless that's implemented in some non-standard
> way too. As it stands, PulseAudio has no control over the routing, so
> the headphone output apparently can't be used at all.

Hrm it's not clear to me.  The routing among which?


Takashi