Sound issues with Dell Latitude 7490 (kabylake)

[Johannes Lundberg]

On Mon, Oct 1, 2018 at 5:43 PM Rodney W. Grimes <
freebsd-rwg at pdx.rh.cn85.dnsmgr.net> 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.
>
>
Thanks for the tips. I will try that.

But, I think there is also something more serious with this. While pulse
audio clients (firefox) seem to play fine, Minecraft which uses OpenAL,
produces crackling noises and eventually crash Minecraft with OpenAL being
the culprit...

>
> > # cat /dev/sndstat
> > Installed devices:
> > pcm0: <Realtek ALC256 (Internal Analog)> (play/rec) default
> > pcm1: <Realtek ALC256 (Front Analog Headphones)> (play)
> > pcm2: <Intel Kabylake (HDMI/DP 8ch)> (play)
> > No devices installed from userspace.
> >
> > # sysctl hw.snd
> > hw.snd.maxautovchans: 16
> > hw.snd.default_unit: 0
> > hw.snd.version: 2009061500/amd64
> > hw.snd.default_auto: 1
> > hw.snd.verbose: 0
> > hw.snd.vpc_mixer_bypass: 1
> > hw.snd.feeder_rate_quality: 1
> > hw.snd.feeder_rate_round: 25
> > hw.snd.feeder_rate_max: 2016000
> > hw.snd.feeder_rate_min: 1
> > hw.snd.feeder_rate_polyphase_max: 183040
> > hw.snd.feeder_rate_presets: 100:8:0.85 100:36:0.92 100:164:0.97
> > hw.snd.feeder_eq_exact_rate: 0
> > hw.snd.feeder_eq_presets:
> > PEQ:16000,0.2500,62,0.2500:-9,9,1.0:44100,48000,88200,96000,176400,192000
> > hw.snd.basename_clone: 1
> > hw.snd.compat_linux_mmap: 0
> > hw.snd.syncdelay: -1
> > hw.snd.usefrags: 0
> > hw.snd.vpc_reset: 0
> > hw.snd.vpc_0db: 45
> > hw.snd.vpc_autoreset: 1
> > hw.snd.timeout: 5
> > hw.snd.latency_profile: 1
> > hw.snd.latency: 5
> > hw.snd.report_soft_matrix: 1
> > hw.snd.report_soft_formats: 1
> >
> > # sysctl dev.pcm
> > dev.pcm.2.bitperfect: 0
> > dev.pcm.2.buffersize: 65536
> > dev.pcm.2.play.vchanformat: s16le:2.0
> > dev.pcm.2.play.vchanrate: 48000
> > dev.pcm.2.play.vchanmode: passthrough
> > dev.pcm.2.play.vchans: 1
> > dev.pcm.2.play.32bit: 24
> > dev.pcm.2.%parent: hdaa1
> > dev.pcm.2.%pnpinfo:
> > dev.pcm.2.%location: nid=3
> > dev.pcm.2.%driver: pcm
> > dev.pcm.2.%desc: Intel Kabylake (HDMI/DP 8ch)
> > dev.pcm.1.bitperfect: 0
> > dev.pcm.1.buffersize: 65536
> > dev.pcm.1.play.vchanformat: s16le:2.0
> > dev.pcm.1.play.vchanrate: 48000
> > dev.pcm.1.play.vchanmode: fixed
> > dev.pcm.1.play.vchans: 1
> > dev.pcm.1.play.32bit: 24
> > dev.pcm.1.%parent: hdaa0
> > dev.pcm.1.%pnpinfo:
> > dev.pcm.1.%location: nid=33
> > dev.pcm.1.%driver: pcm
> > dev.pcm.1.%desc: Realtek ALC256 (Front Analog Headphones)
> > dev.pcm.0.bitperfect: 0
> > dev.pcm.0.buffersize: 65536
> > dev.pcm.0.rec.vchanformat: s16le:2.0
> > dev.pcm.0.rec.vchanrate: 48000
> > dev.pcm.0.rec.vchanmode: fixed
> > dev.pcm.0.rec.vchans: 1
> > dev.pcm.0.rec.autosrc: 2
> > dev.pcm.0.rec.32bit: 24
> > dev.pcm.0.play.vchanformat: s16le:2.0
> > dev.pcm.0.play.vchanrate: 48000
> > dev.pcm.0.play.vchanmode: fixed
> > dev.pcm.0.play.vchans: 2
> > dev.pcm.0.play.32bit: 24
> > dev.pcm.0.%parent: hdaa0
> > dev.pcm.0.%pnpinfo:
> > dev.pcm.0.%location: nid=20,18
> > dev.pcm.0.%driver: pcm
> > dev.pcm.0.%desc: Realtek ALC256 (Internal Analog)
> > dev.pcm.%parent:
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>
> --
> Rod Grimes
> rgrimes at freebsd.org
>