Buggy sound on HDMI passthrough

[proximity]

Hi,

I have passthrough configured on a NVidia card and it works for a while and then suddenly the sound 'gets stuck' and there only comes noise out. If I then move the mouse it will continue fine. First I thought it was the screensaver so I disabled that but it made no difference. Anybody experienced this and/or knows how to fix it?

thx!

 

[Stefan_R]

Some users of passthrough devices with similar issues have reported success with enabling Message Signaled Interrupts. See here: https://pve.proxmox.com/wiki/Pci_passthrough#HDMI_Audio_crackling.2Fbroken

 

[proximity]

Thank you for your reply. According to that link MSI is enabled on linux guests by default. Checking it it looks like its enabled:

06:10.0 VGA compatible controller: NVIDIA Corporation GP108 [GeForce GT 1030] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: Micro-Star International Co., Ltd. [MSI] GP108 [GeForce GT 1030]
        Physical Slot: 16
        Flags: bus master, fast devsel, latency 0, IRQ 40
        Memory at c0000000 (32-bit, non-prefetchable) [size=16M]
        Memory at 800000000 (64-bit, prefetchable) [size=256M]
        Memory at 810000000 (64-bit, prefetchable) [size=32M]
        I/O ports at 9000 [size=128]
        [virtual] Expansion ROM at c1020000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Kernel driver in use: nvidia
        Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

 

[proximity]

Actually that was the video part. The audiopart still had it as disabled. After doing a

echo "options snd-hda-intel enable_msi=1" |sudo tee /etc/modprobe.d/snd-hda-intel.conf

it also shows enabled for the audio device.
Lets see if it comes back.