ubuntu 16.10 internal speakers don't work, but headphones do

[Austin Clements]

Under sound settings only headphone output is listed as an option, no internal speakers are listed. Headphone playback does work. In alsamixer, speaker output was at 0 and muted, but unmuting and increasing volume does not produce playback in speakers.

ASUS X550LB laptop

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
Uname: Linux 4.8.0-26-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: austinclem1 1647 F.... pulseaudio
 /dev/snd/controlC0: austinclem1 1647 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Oct 28 20:42:56 2016
InstallationDate: Installed on 2016-10-29 (0 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: austinclem1 1647 F.... pulseaudio
 /dev/snd/controlC0: austinclem1 1647 F.... pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [X550LB, Realtek ALC3236, Speaker, Internal] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/26/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X550LB.403
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X550LB
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550LB.403:bd06/26/2014:svnASUSTeKCOMPUTERINC.:pnX550LB:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550LB:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: X550LB
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

[Austin Clements (austinclementsbass)]

PSA: This may be related to a broken headphone jack that is supposed to detect whether headphones are plugged in and change output accordingly. Work around in ubuntu right now is to run alsamixer from terminal, select correct soundcard, then disable auto-mute, then unmute and turn up speakers.

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 16.10 (yakkety) reached end-of-life on July 20, 2017.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.