I've tried:
ICH6 
- that was the orig default in the VM when created
AC97
I cleared syslog
- I changed to AC97 (shutdown vm and restarted it & verified it was now set to 
AC97)
and got this in syslog which appears the SAME as with ICH6 despite having 
switch to AC97:

Nov  1 06:27:52 bmullan-virtual-machine pulseaudio[1799]: [alsa-sink-Intel ICH] 
alsa-sink.c: ALSA woke us up to write new data to the device, but there was 
actually nothing to write!
Nov  1 06:27:52 bmullan-virtual-machine pulseaudio[1799]: [alsa-sink-Intel ICH] 
alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_intel8x0'. 
Please report this issue to the ALSA developers.
Nov  1 06:27:52 bmullan-virtual-machine pulseaudio[1799]: [alsa-sink-Intel ICH] 
alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent 
snd_pcm_avail() returned 0 or another value < min_avail.

attached the /var/log/syslog of the AC97 vm start
note it shows AC97 clocking messages but it the messages above still show 
[alsa-sink-intel ICH] 
maybe I don't understand that message but it looks like sound never changes 
from ICH even if virt-manager indicates it is AC97


** Attachment added: "syslog for startup after switch to ac97 (and after having 
cleared /var/log/syslog"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1246929/+attachment/3897592/+files/ac97-syslog

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https://bugs.launchpad.net/bugs/1246929

Title:
  alsa bug in KVM virtual machines

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