Weird enough, once the audio is broken, it's broken for all VMs (windows, linux, doesn't matter) –but once you fix it like this, it's fixed everywhere (the wtf moment).

So far this is the only solution that worked for me, and it works reliably again when I lose audio and I restore it with this technique. To fix this: Go to devicemgr in the Windows guest VM, right-click to the sound device, disable it. It lead to one result: The VM audio worked on one Mac, but not the other. Heck, I even copied the Virtual Machine along with the disk and settings from one machine to another.

I upgraded both of my Macs to the same version. OK I did A LOT of debugging on this one, and there's no definite solution to this, it's a glitch. If I force-poweroff a VM from VirtualBox, the entire VirtualBox process crashes on macOS. Here's the VBox.log from the vm start-try-shutdown cycle: Symptom: VM shutdown crashes VirtualBox It successfully recognized the change, but still doesn't work: So I installed the archaic Realtek AC'97 audio drivers for Vista/7 on Windows 10. Instead of Intel HD audio controller setting on VirtualBox, I tried using the ICH AC97 setting. I tried other paravirtualization settings like 'None' or 'Default' instead of Hyper-V but no luck. dxdiag shows Sound is fine (says 'No problems found' and device name is 'Speakers (High Definition Audio Device):.I tried Sound troubleshooting, nothing came back.I disabled driver signature verification.Windows Guest Additions are fully installed.Differently than windows, when I try to play some video/audio on Firefox, the player actually never starts the video or audio. I tried Ubuntu Desktop (Live CD), it also thinks audio is available. I suspect this might have happened (not sure) after upgrading VirtualBox, so I tried latest version 5.2.23, as well as some old versions like 5.2.14 and 5.2.18. Here's what I tried so far: Different versions of VirtualBox

The guest OSes think there's audio available. I tried another Mac I own (that one has macOS 10.14 Mojave installed), when I install the same image, with the same config, and with the same VirtualBox, it works there.I tried doing a clean install from ISO with all default Windows 10 settings on VirtualBox, no audio there, either.A VirtualBox version update or me tweaking settings might have caused this, I am not sure. I am running Windows 10 Home as a guest OS in a VirtualBox VM, on macOS host running 10.13.6 High Sierra with VirtualBox 5.2.23.Īudio worked a few times, then it stopped working.

Virtualbox mac os on windows 10 host