Re: Sound issues with Dell Latitude 7490 (kabylake)

> 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.

> 
> # 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