Comment 12 for bug 419182

I finally found a driver for win7 64bit which is working with the ac97 sound card:
http://www.64bitdrivers.com/driver.php?id=1375

If you download the driver sk35558.exe and edit the inf file for the PCI IDs used by kvm it will install with a warning about unsigned code.
Add the following line to the [Conexant.NTamd64] Section in the file cp6308Ba.inf:

"%*WDM_AMCAUD.DeviceDesc%=WDM_AMCAUD,PCI\VEN_8086&DEV_2415&SUBSYS_00008086"

I think this helps to mitigates the issue till we update to a new version with hda sound support.