Pass-Through Microphone Audio Broken Virtualbox Ver: 6.1.22-144080~Ubuntu~eoan

[MSterba]

Problem Statement:

Unable to pass microphone audio from Windows guest to Linux host.

Verified with both Windows 7x64 & Windows 10x64 using built in recording application

(NOTE: Though not supported, it appears that this is now happening with my Android OS Guest. Microphone audio pass-through was working prior to latest Virtualbox updates)

pavucontrol used in Linux host to control and verify existence of audio in/out

Virtualbox initial Audio settings:

Enabled Audio

Host Audio Driver = Pulse Audio

Audio Controller = Intel HD Audio

Extended Features: Enabled both Audio Input & Output

Additional steps taken:

Verified user permissions attached to vboxuser. Assumed that the newer Kernel and Inten Chipset combination not yet compatible with Virtualbox. Obtained 6305_Vista_PG537 audio driver and installed in both Windows guests, then changed Audio Controller to ICH AC97. I'm still able to pass through Speaker Audio, but Microphone Audio remains elusive in both Windows versions. In addition, did try the Sound Blaster Audio Controller, but as expected, lost all audio without a matching Windows drivers. Reloaded new Windows guest to re-verify installation, result log attached

Host System:

OS: Ubuntu 20.04 x86_64

Kernel: 5.11.0-7614-generic

Desktop Environment: KDE

CPU: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz

RAM: -14936 MB / 23894 MB

Disk: 157G / 912G

Virtualbox Ver: 6.1.22-144080~Ubuntu~eoan

Virtualbox-ext-pack Ver: 6.1.22

Guest System:

OS: Win10_20H2_v2_English_x64.iso, No Service Pack

Virtualbox VBoxGuestAdditions.iso

Base Memory: 8192

Enable I/O APIC

Use Default and Nested paging for Hardware Virtualization: Enabled Nested Paging

Processors: 2

Extended Features: PAE/NX Enabled

Paravirtualization Interface: Default

(VT-xAMD-V,Nested Paging, PAE/NX, Hyper-V Paravirtualization)

Video Memory: 256Mb

Graphics Controller: VBoxSVGA

Acceleration: Enabled 3D Acceleration

[MSterba]

Log capture, new installation, looping problem with Michrophone/line-in audio on guest

[MSterba]

Hello,

Yesterday I did a firmware and pulseaudio update on my effected laptop resulting in a change of situation.

When booting up the Windows 10 guest, I now have a virtualbox pulseaudio line-in audio tab appear that shows active microphone audio being passed using pavucontrol on the host.

I believe this is a positive step, but it doesn't show up as an option to select in the Windows 10 guest nor does the microphone audio get passed either.

I have gone through disabling securities that I could find that might influence the guest, but no luck on getting virtualbox line-in to show up.