Audio hangs when host screen turns off

[IzK]

I upgrade to 5.2.22 from 5.2.20 because it should fix the problem, according to the changelog: "Audio: fixed a regression in the Core Audio backend causing a hang when returning from host sleep when processing input buffers".

But it's not, at least for me. Tested under W2k8 R2 (host) and W7 (guest). Once the screen enter into power save mode, the audio hangs until I shutdown the guest machine (rebooting the machine doesn't solve the problem).

[janitor]

#18148