Guest chosen is CentOS 6 with latest updates.

Client connecting from user portal is Fedora 23 on an Asus laptop U36SD where audio works and lspci gives
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)

On CentOS 6 guest the audio adapter detected by OS with lspci is
00:08.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 01)

It seems all ok, apart that on guest actually I don't get any audio, also from test speakers page ;-)

Both on guest and on client the volume bar is near the maximum.

Any hints about debugging?

From host point of view the qemu-kvm command line is this one below

I don't understand the env variable
QEMU_AUDIO_DRV=none
???

If it can be of any importance, I initially configured the guest without sound card and in fact in gnome I saw the audio card as "dummy".

Then I powered off the guest and enabled sound card from user portal edit vm (I see it enabled also from admin portal btw...) and then powered on the VM.

Now the sound card seems to be present but no audio

Thanks in advance,

Gianluca

2016-06-11 09:22:13.698+0000: starting up libvirt version: 1.2.17, package: 13.el7_2.4 (CentOS BuildSystem <http://bugs.centos.org>, 2016-03-
31-16:56:26, worker1.bsys.centos.org), qemu version: 2.3.0 (qemu-kvm-ev-2.3.0-31.el7_2.10.1)
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name c6desktop -S -machine pc-i440
fx-rhel7.2.0,accel=kvm,usb=off -cpu Broadwell-noTSX -m size=3145728k,slots=16,maxmem=4294967296k -realtime mlock=off -smp 1,maxcpus=16,socket
s=16,cores=1,threads=1 -numa node,nodeid=0,cpus=0,mem=3072 -uuid 68a82ada-a1d2-44d0-85b0-f3a08cc2f579 -smbios type=1,manufacturer=oVirt,produ
ct=oVirt Node,version=7-2.1511.el7.centos.2.10,serial=AC1EDDD3-CAF1-2711-EE16-B8AEED7F1711,uuid=68a82ada-a1d2-44d0-85b0-f3a08cc2f579 -no-user
-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-c6desktop/monitor.sock,server,nowait -mon chardev=charmo
nitor,id=monitor,mode=control -rtc base=2016-06-11T09:22:13,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boo
t menu=on,strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x9.0x7 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x
9.0x2 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x9.0x1 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,
multifunction=on,addr=0x9 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x3 -device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pc
i.0,addr=0x4 -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -drive
file=/rhev/data-center/00000001-0001-0001-0001-000000000343/572eabe7-15d0-42c2-8fa9-0bd773e22e2e/images/aff55e62-6a41-4f75-bbd3-78561eae18f3/
f520473e-8fbe-4886-bb64-921b42edf499,if=none,id=drive-virtio-disk0,format=raw,serial=aff55e62-6a41-4f75-bbd3-78561eae18f3,cache=none,werror=s
top,rerror=stop,aio=threads -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev t
ap,fd=28,id=hostnet0,vhost=on,vhostfd=29 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:16:01:51,bus=pci.0,addr=0x7 -chardev soc
ket,id=charserial0,path=/var/run/ovirt-vmconsole-console/68a82ada-a1d2-44d0-85b0-f3a08cc2f579.soc
k,server,nowait -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channels/68a82ada-a1d2-44d0-85b0-f3a08cc2f579.com.redhat.rhevm.vdsm,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.rhevm.vdsm -chardev socket,id=charchannel1,path=/var/lib/libvirt/qemu/channels/68a82ada-a1d2-44d0-85b0-f3a08cc2f579.org.qemu.guest_agent.0,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=org.qemu.guest_agent.0 -chardev spicevmc,id=charchannel2,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=3,chardev=charchannel2,id=channel2,name=com.redhat.spice.0 -spice port=5901,tls-port=5902,addr=0,x509-dir=/etc/pki/vdsm/libvirt-spice,seamless-migration=on -vnc 0:3,password -device qxl-vga,id=video0,ram_size=67108864,vram_size=8388608,vgamem_mb=16,bus=pci.0,addr=0x2 -device intel-hda,id=sound0,bus=pci.0,addr=0x8 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1 -chardev spicevmc,id=charredir2,name=usbredir -device usb-redir,chardev=charredir2,id=redir2 -chardev spicevmc,id=charredir3,name=usbredir -device usb-redir,chardev=charredir3,id=redir3 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -msg timestamp=on
2016-06-11T09:22:13.748410Z qemu-kvm: warning: CPU(s) not present in any NUMA nodes: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
2016-06-11T09:22:13.748524Z qemu-kvm: warning: All CPU(s) up to maxcpus should be described in NUMA config
main_channel_link: add main channel client
main_channel_handle_parsed: net test: latency 21.910000 ms, bitrate 51635025 bps (49.242997 Mbps)
inputs_connect: inputs channel client create
red_dispatcher_set_cursor_peer:
main_channel_handle_parsed: agent start
main_channel_handle_parsed: agent start