Public bug reported:

since some time now, I have a very strange problem with audio output on
a Windows Vista guest. Right after booting the guest, audio output does
not work (that is: I can PLAY audio, but can't hear anything, although
volume is at 100%). If I leave the guest running for some hours (don't
know how many, I usually try again next day), audio output starts to
work just fine.

I'm using es1370 emulation, but I get the same results with the other
alternatives, too.

Guest: Windows Vista SP1 32bit

Host: Ubuntu 12.10 64bit
% dpkg --list|grep -e kvm -e qemu
ii  kvm-ipxe                             1.0.0+git-3.55f6c88-0ubuntu5       all 
         PXE ROM's for KVM
ii  qemu-common                 1.2.0+noroms-0ubuntu2                 all       
   qemu common functionality (bios, documentation, etc)
ii  qemu-kvm                           1.2.0+noroms-0ubuntu2        amd64       
 Full virtualization on supported hardware
ii  qemu-kvm-spice                1.2.0-2012.09-0ubuntu1         amd64        
Full virtualization on amd64 hardware
ii  qemu-utils                           1.2.0+noroms-0ubuntu2        amd64     
   qemu utilities


# lsb_release -rd
Description:    Ubuntu quantal (development branch)
Release:        12.10


# apt-cache policy qemu-kvm
qemu-kvm:
  Installiert:           1.2.0+noroms-0ubuntu2
  Installationskandidat: 1.2.0+noroms-0ubuntu2
  Versionstabelle:
 *** 1.2.0+noroms-0ubuntu2 0
        500 http://de.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: qemu (not installed)
ProcVersionSignature: Ubuntu 3.5.0-15.23-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
NonfreeKernelModules: openafs
ApportVersion: 2.6.1-0ubuntu1
Architecture: amd64
Date: Tue Oct  2 10:20:10 2012
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
KvmCmdLine: Error: command ['ps', '-C', 'kvm', '-F'] failed with exit code 1: 
UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
MachineType: BIOSTAR Group A780L3G
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-15-generic 
root=/dev/mapper/hostname-root_ubuntu ro crashkernel=384M-2G:64M,2G-:128M
SourcePackage: qemu-kvm
UpgradeStatus: Upgraded to quantal on 2012-09-07 (24 days ago)
dmi.bios.date: 04/21/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080014
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: A780L3G
dmi.board.vendor: BIOSTAR Group
dmi.chassis.asset.tag: None
dmi.chassis.type: 3
dmi.chassis.vendor: BIOSTAR Group
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr080014:bd04/21/2010:svnBIOSTARGroup:pnA780L3G:pvr:rvnBIOSTARGroup:rnA780L3G:rvr:cvnBIOSTARGroup:ct3:cvr:
dmi.product.name: A780L3G
dmi.sys.vendor: BIOSTAR Group

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug quantal

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https://bugs.launchpad.net/bugs/1060053

Title:
  Audio starts working several hours after starting Windows Vista guest

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