Alder Lake HW Transcoding on Proxmox Plex VM

Plex Media Server Desktops & Laptops
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Server Version#: Version 1.28.1.6041
Player Version#: Version 4.84.1

Has anyone gotten Plex HW transcoding working reliably within a Proxmox hosted Ubuntu VM with an Alder Lake processor + igpu? HW transcoding will work for 2-3 minutes before a large number of GPU reset messages start appearing in the kernel log. HW transcoding will then stop working and the number of reset messages will ramp up to 100’s a minute. You have to hard power-cycle the machine – both the shutdown and reboot commands will no longer work.

Info on hosting environment:

  1. Proxmox 7.2 hosted VM with full GPU passthrough of i5-12500 CPU w/ 770 UHD gpu. Machine is 4-cores (host CPU), 4gb of RAM.
  2. VM is Ubuntu 22.04 running 5.19.0 kernel.
  3. Plex is running in linuxserver.io docker container on Plex Media Server Version 1.28.1.6041

Kernel “uname -a”:
Linux spex 5.19.0-051900-generic #202207312230 SMP PREEMPT_DYNAMIC Sun Jul 31 22:34:11 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

I also tried running outside of docker directly on the VM using the July 2022 forum preview package. Same hangs happened. I would run directly on the Proxmox host but I can’t risk the stability.

Thank you in advance for any input. I’ve tried going through as many of the existing threads and am starting this one as it’s VM-focused.

Plex Media Server Logs_2022-08-09_13-33-44.zip (1.9 MB)

edit: re-formatted kernel version

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I switched to using an LXC container with Ubuntu 20.04 on the Proxmox hosts. Too early to claim victory but early results are promising as the system doesn’t crash within the first couple minutes with GPU hangs.

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