[HDA-Intel - HDA Intel, playback] Mute audio

[Bráulio]

sound is mute on all apps (vlc, mplayer, flash)

alsamixer doesnt show any control, but shows the sound card.
pavucontrol show sound but no hardware devices on output

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pulseaudio 1:4.0-0ubuntu11
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic i686
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: i386
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D1', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: XFCE
Date: Wed Aug 13 09:30:41 2014
InstallationDate: Installed on 2014-08-13 (0 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140723)
SourcePackage: pulseaudio
Symptom: audio
Symptom_Card: HDA-Intel - HDA Intel
Title: [HDA-Intel - HDA Intel, playback] Pulseaudio fails to detect card
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/12/2008
dmi.bios.vendor: Acer
dmi.bios.version: V3.60
dmi.board.name: Grapevine
dmi.board.vendor: Acer
dmi.board.version: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAcer:bvrV3.60:bd08/12/2008:svnAcer:pnAspire5610:pvrV3.60:rvnAcer:rnGrapevine:rvrN/A:cvnAcer:ct10:cvrN/A:
dmi.product.name: Aspire 5610
dmi.product.version: V3.60
dmi.sys.vendor: Acer