[HDA-Intel - HDA Intel, playback] No output device shown; works in Windows

[Ken Edensor]

Ubuntu 18.04
No device shown in Settings-> Sound but works fine on this Sony Vaio in Windows XP

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic i686
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ken 1556 F.... pulseaudio
                      ken 22363 F.... alsamixer
CurrentDesktop: ubuntu:GNOME
Date: Sat Jun 23 16:46:08 2018
InstallationDate: Installed on 2018-05-12 (42 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release i386 (20170412)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed
Symptom_Card: Built-in Audio - HDA Intel
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gdm 980 F.... pulseaudio
                      ken 1556 F.... pulseaudio
                      ken 22363 F.... alsamixer
Symptom_Type: No sound at all
Title: [HDA-Intel - HDA Intel, playback] No sound at all
UpgradeStatus: Upgraded to bionic on 2018-05-28 (26 days ago)
dmi.bios.date: 05/19/2006
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R0044J2
dmi.chassis.asset.tag: Reserved
dmi.chassis.type: 10
dmi.chassis.vendor: Reserved
dmi.chassis.version: Reserved
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR0044J2:bd05/19/2006:svnSonyCorporation:pnVGN-FS515E:pvrC3LMFF3M:cvnReserved:ct10:cvrReserved:
dmi.product.name: VGN-FS515E
dmi.product.version: C3LMFF3M
dmi.sys.vendor: Sony Corporation
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2018-06-13T07:13:49.694143

[Ken Edensor (kene1006)]

Please don't let the 'options' addition at the end of /etc/modprobe.d/alsa-base.conf mislead you - there was no output device shown before I added it, nor after I commented it out and restarted my PC.