Comment 0 for bug 1036214

I think this is related or even the same as Bug #494099. After sound settings setup in 5.1 or 7.1 mode start music playback (I use Banshee most frequently, but also tried in Rhythmbox). If tracks are swithed automatically one after another in playlist (in random mode), for some time everything is OK. If I switch to next track manually even once, subwoofer channel disappears and I have to set sound settings again to some value and then again to 5.1 to enable it. The most interesting thing - subwoofer channel disappear in Rhythmbox doesn't affect Banshee when they are running at the same time. After disappear in Banshee, I launched VLC with a movie and subwoofer channel was active there without any setup.
I have 2 outputs (analog and digital) on default sound card and several sound inputs on 3 different devices. Only one of inputs is set up as active.
I have 12.04 upgraded from 11.10 (don't remember which of 11.04 or 11.10 was installed as new OS).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-27-generic-pae 3.2.0-27.43
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic-pae 3.2.21
Uname: Linux 3.2.0-27-generic-pae i686
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu11
Architecture: i386
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfb5f8000 irq 47'
   Mixer name : 'VIA VT1708S'
   Components : 'HDA:11060397,1043836c,00100000'
   Controls : 47
   Simple ctrls : 23
Card1.Amixer.info:
 Card hw:1 'U0x46d0x825'/'USB Device 0x46d:0x825 at usb-0000:00:1d.0-1.2, high speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:0825'
   Controls : 2
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 6144
   Mono: Capture 0 [0%] [6.00dB] [on]
Card2.Amixer.info:
 Card hw:2 'Generic'/'HD-Audio Generic at 0xfb6fc000 irq 48'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100200'
   Controls : 6
   Simple ctrls : 1
Card2.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Card3.Amixer.info:
 Card hw:3 'Bt878'/'Brooktree Bt878 at 0xfafff000, irq 17'
   Mixer name : 'Bt87x'
   Components : ''
   Controls : 3
   Simple ctrls : 5
Date: Mon Aug 13 17:50:55 2012
HibernationDevice: RESUME=UUID=bb159f84-e9c8-4b97-abc3-06fd08e52fa9
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
IwConfig:
 ppp0 no wireless extensions.

 lo no wireless extensions.

 eth0 no wireless extensions.
MachineType: System manufacturer System Product Name
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic-pae root=UUID=1f7d7bdc-5395-440c-9509-060a1b3f065d ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-27-generic-pae N/A
 linux-backports-modules-3.2.0-27-generic-pae N/A
 linux-firmware 1.79
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to precise on 2012-04-29 (106 days ago)
dmi.bios.date: 11/13/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0602
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P7P55 LX
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0602:bd11/13/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55LX:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer