[broadwell-rt286 - broadwell-rt286, playback] No sound at all but sound controls available

[Igor]

hi, this is fresh install of Ubuntu 18.04. I have sound controls but neither speakers nor headphones generate any sound. Computer is HP Spectre x360 from 2015

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC1D0c: igor 1455 F...m pulseaudio
 /dev/snd/controlC1: igor 1455 F.... pulseaudio
 /dev/snd/controlC0: igor 1455 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 28 01:45:51 2018
InstallationDate: Installed on 2018-04-27 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:broadwellrt286 failed
Symptom_Card: Built-in Audio - broadwell-rt286
Symptom_Type: No sound at all
Title: [broadwell-rt286 - broadwell-rt286, playback] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/22/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F.47
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 802D
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 58.63
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF.47:bd11/22/2017:svnHewlett-Packard:pnHPSpectrex360Convertible13:pvr:rvnHewlett-Packard:rn802D:rvr58.63:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=SPT
dmi.product.name: HP Spectre x360 Convertible 13
dmi.sys.vendor: Hewlett-Packard