Comment 0 for bug 878986

I am using keyboard shortcuts to increase/decrease/mute volume by executing:
amixer -q sset Master 5+
amixer -q sset Master 5-
amixer -q sset Master toggle

From when I have updated to Ubuntu 11.10, 'amixer sset Master toggle' does mute the volume, but when i execute it again it does not unmute it. In command line, it looks fine:

:~$ amixer sset Master toggle
Simple mixer control 'Master',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 31
  Mono: Playback 16 [52%] [-22.50dB] [off]

:~$ amixer sset Master toggle
Simple mixer control 'Master',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 31
  Mono: Playback 16 [52%] [-22.50dB] [on]

but it remains muted. I use pavucontrol to unmute sound from the GUI.

Info:
:~$ apt-cache policy alsa-utils
alsa-utils:
  Installed: 1.0.24.2-0ubuntu8
  Candidate: 1.0.24.2-0ubuntu8
  Version table:
 *** 1.0.24.2-0ubuntu8 0
        500 http://rs.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
        100 /var/lib/dpkg/status

:~$ lsb_release -rd
Description: Ubuntu 11.10
Release: 11.10

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-12-generic 3.0.0-12.20
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: instructor 19328 F.... pulseaudio
 /dev/snd/pcmC0D0p: instructor 19328 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfe9f8000 irq 43'
   Mixer name : 'Realtek ALC883'
   Components : 'HDA:10ec0883,1043829f,00100002'
   Controls : 37
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfeafc000 irq 44'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100000'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Thu Oct 20 19:31:13 2011
HibernationDevice: RESUME=UUID=cf6e9ff7-a63e-457c-aba4-706765c58de1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
MachineType: System manufacturer P5K
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=5611c46a-40ee-4ded-bbda-b8365335826b ro acpi_enforce_resources=lax quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-12-generic N/A
 linux-backports-modules-3.0.0-12-generic N/A
 linux-firmware 1.60
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to oneiric on 2011-10-16 (3 days ago)
dmi.bios.date: 07/03/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0603
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5K
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0603:bd07/03/2007:svnSystemmanufacturer:pnP5K:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5K:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: P5K
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer