[TravelMate P256-M, Realtek ALC283, Speaker, Internal] No sound at all

[peter]

No sound from the speakers which work fine "on test". Problem is recent as ok last month.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.16.0-53.72~14.04.1-generic 3.16.7-ckt18
Uname: Linux 3.16.0-53-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.18
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: peter 1793 F.... pulseaudio
 /dev/snd/controlC0: peter 1793 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Nov 17 13:45:03 2015
InstallationDate: Installed on 2015-04-07 (223 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: peter 1793 F.... pulseaudio
 /dev/snd/controlC0: peter 1793 F.... pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: No sound at all
Title: [TravelMate P256-M, Realtek ALC283, Speaker, Internal] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2014
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.09
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: BA50_HB
dmi.board.vendor: Acer
dmi.board.version: V1.09
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.09:bd07/11/2014:svnAcer:pnTravelMateP256-M:pvrV1.09:rvnAcer:rnBA50_HB:rvrV1.09:cvnAcer:ct10:cvrChassisVersion:
dmi.product.name: TravelMate P256-M
dmi.product.version: V1.09
dmi.sys.vendor: Acer