Sound issues with Dell Latitude 7490 (kabylake)
Jakob Alvermark
jakob at alvermark.net
Mon Oct 1 19:37:16 UTC 2018
On 10/1/18 5:57 PM, Johannes Lundberg 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?
>
> # 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:
You could try
sysctl dev.hdaa.0.nid33_config="as=1 seq=15 device=Headphones"
sysctl dev.hdaa.0.reconfig=1
It should result in you having only one pcm device for the two outputs
and it should switch from
internal to external when you plug in the external speakers and vice versa.
To make it permanent put 'hint.hdaa.0.nid33.config="as=1 seq=15
device=Headphones"' in your loader.conf
The loud buzz is a bit worrying, it could be related to the problem I
have been having, where I got strange sound
when using headphones on my laptop. I have worked around it by patching
the sound driver, I have kept my local
patch for years.
Jakob
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