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Description of problem:
When graphics protocol is set to "SPICE + VNC", libvirt stars qemu process with environment variable QEMU_AUDIO_DRV=none which causes that client can't hear the VM. (If graphical protocol is set to "SPICE" only, then libvirt sets QEMU_AUDIO_DRV=spice and audio works fine.)

Version-Release number of selected component (if applicable):
rhevm 3.6.8.1-0.1.el6,
ovirt 4.1.0-0.0.master.20160802171327.gitd8decfe.el7.centos

How reproducible:
100%

Steps to Reproduce:
1. Create a VM with settings: Optimized for=Desktop, Graphics Protocol=SPICE+VNC, check "Soundcard enabled" (Console side-tab)
2. Run the VM
3. Connect to the host the VM is running on and on that host:
4. Check qemu process environment variables (also in /var/log/libvirt/qemu/{vm-name}.log

Actual results:
QEMU_AUDIO_DRV=none and consequently no sound from VM

Expected results:
VM sound is accessible even with graphics protocol set to "SPICE + VNC". 

Additional info:
Origin: http://lists.ovirt.org/pipermail/users/2016-August/042233.html

is it a regression? do we know from when?

I don't think it ever worked. When you use only SPICE or only VNC, the sound works. Than we introduced the feature of SPICE + VNC together and the sound does not work in this case. So it is not really a regression but a bug in the feature.

Confirmed (environment described in the additional info web link of description section) with:

Engine: oVirt 3.6.6.2-1.el7.centos
Host CentOS 7.2 based on 3.6.6 with:
qemu-kvm-ev-2.3.0-31.el7_2.10.1.x86_64
libvirt-daemon-1.2.17-13.el7_2.4.x86_64
vdsm-4.17.28-0.el7.centos.noarch

Created attachment 1195935 [details]
vm_device_screenshot

Created attachment 1195939 [details]
vm_device_screenshot

The device is actually present but sound is not transferred over the protocol.

The patch http://gerrit.ovirt.org/63093 will be tracked in cloned bug 1376510.

proper fix should be in libvirt when both SPICE and VNC is configured

*** This bug has been marked as a duplicate of bug 1375433 ***