Sound issues with Dell Latitude 7490 (kabylake)

[Emmanuel Vadot]

On Tue, 2 Oct 2018 12:03:50 -0700 (PDT)
"Rodney W. Grimes" <freebsd-rwg at pdx.rh.CN85.dnsmgr.net> wrote:

> > On 10/2/18 6:27 PM, Rodney W. Grimes wrote:
> > >> On 10/1/18 6:43 PM, Rodney W. Grimes wrote:
> > >>>> Hi
> > >>>>
> > >>>> While sound work out of the box (with headphone switching) on the 1-2 year
> > >>>> older Latitude 7270, it does not on my new machine.
> > >>>>
> > >>>> The internal speaker works fine. If I plug in external speakers in the
> > >>>> headphone jack, sound still goes to the internal speaker while a very load
> > >>>> buzz comes from the external speakers.
> > >>>>
> > >>>> Do we have a solution for this?
> > >>> I do not believe we have anything that detects stuff plugged into
> > >>> and removed from the newer sound stuff that needs switching to
> > >>> change from internal to external speakers.
> > >>>
> > >>> I think you need to do what I have to do when I plug in external
> > >>> speakers on my thinkpad x230:
> > >>> sysctl hw.snd.default_unit=1
> > >>>
> > >>> And when I unplug them I have to do:
> > >>> sysctl hw.snd.default_unit=0
> > >>>
> > >>> to switch back to the internal speakers.
> > >>
> > >> Hi Rod,
> > >>
> > >>
> > >> Can you post the output of 'sysctl dev.pcm' and 'sysctl dev.hdaa'
> > > Sure:
> > > @x230a:~ # sysctl dev.pcm
> > > dev.pcm.4.bitperfect: 0
> ...
> ...
> > 
> > Thanks. So if you try this:
> > 
> > sysctl dev.hdaa.0.nid24_config="as=4 seq=15"
> > sysctl dev.hdaa.0.nid21_config="as=1 seq=15"
> > sysctl dev.hdaa.0.reconfig=1
> 
> Works, thank you!

 Dude that's some serious shit !
 Jacob, is this documented somewhere ? 
 I haven't read the driver code but what does as/seq etc represent
there ?

 What could we do to make this
easier for users ?

> > That should make pcm0 and pcm1 "merge" into pcm0 and enable 
> > auto-switching when plugging something
> > 
> > in the headphones jack.
> > 
> > If it works you might want to put the following two lines in 
> > /boot/loader.conf
> > 
> > hint.hdaa.0.nid24.config="as=4 seq=15"
> > hint.hdaa.0.nid21.config="as=1 seq=15"
> 
> 
> -- 
> Rod Grimes                                                 rgrimes at freebsd.org
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-- 
Emmanuel Vadot <manu at bidouilliste.com> <manu at freebsd.org>