I've now tested the patch myself by patching kernel 4.10.0.21.23.
Unfortunately, it does not fix the problem.
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https://bugs.launchpad.net/bugs/1428121
Title:
Intel HDMI Audio not workin
Ubuntu 17.04 with 4.10.0-21, libvirt 2.5.0, QEMU 2.8, and virt-manager 1.3.2.
Gigabyte EX58-UD3R Rev 1.6, ICH10 (00:1b.0) audio, x5675 (Westmere).
Nvidia GTX 275 for the host, GTX 1050 Ti for the VM.
Added to /etc/default/grub, updated grub, rebooted, and replaced the previous
entry each time:
i
