No Audio output/passthrough from Linux Guest to Windows Host

[kellbrir]

I'm running an Ubuntu 18.04 Guest on a Windows 10 Host in VirutalBox 6.1.26. When I attempt to play sound from the Ubuntu host using ALSA I get no sound passthrough to the host. This last worked in VirtualBox 6.1.18 with no problem. Since my upgrade it no longer works. When I try to start the audio I get the following specific errors in my host log :

00:00:54.313145 VMMDev: Guest Log: 17:15:44.427713 main VBoxService 6.1.24 r145751 (verbosity: 0) linux.amd64 (Jul 15 2021 18:33:29) release log 00:00:54.313157 VMMDev: Guest Log: 17:15:44.427715 main Log opened 2021-10-16T17:15:44.427710000Z 00:00:54.313182 VMMDev: Guest Log: 17:15:44.427760 main OS Product: Linux 00:00:54.313198 VMMDev: Guest Log: 17:15:44.427778 main OS Release: 4.15.0-159-generic 00:00:54.313212 VMMDev: Guest Log: 17:15:44.427793 main OS Version: #167-Ubuntu SMP Tue Sep 21 08:55:05 UTC 2021 00:00:54.313227 VMMDev: Guest Log: 17:15:44.427807 main Executable: /opt/VBoxGuestAdditions-6.1.24/sbin/VBoxService 00:00:54.313230 VMMDev: Guest Log: 17:15:44.427807 main Process ID: 1890 00:00:54.313232 VMMDev: Guest Log: 17:15:44.427808 main Package type: LINUX_64BITS_GENERIC 00:00:54.314916 VMMDev: Guest Log: 17:15:44.429498 main 6.1.24 r145751 started. Verbose level = 0 00:00:54.315580 VMMDev: Guest Log: 17:15:44.430155 main vbglR3GuestCtrlDetectPeekGetCancelSupport: Supported (#1) 00:00:54.315743 Guest Control: GUEST_MSG_REPORT_FEATURES: 0x7, 0x8000000000000000 00:01:09.441017 HDA: DP base (lower) set: 0x000000003ae32000 00:01:09.441031 HDA: DMA position buffer is enabled 00:01:09.498001 Audio: Warning: Scheduling hint of stream '[WasAPI] Front:0' is bigger (140707423584279ms) than used period size (0ms) 00:01:09.541955 WasAPI: IAudioClient::IsFormatSupported(,2ch S16 44100Hz,) failed: E_INVALIDARG 00:01:09.541973 Audio: Failed to initialize stream '[WasAPI] Front:0': VERR_AUDIO_STREAM_COULD_NOT_CREATE

[kellbrir]

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