No frame buffer device (fb0)

Phiolin

Member
Oct 8, 2019
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Somehow none of my PVE hypervisors is currently having a framebuffer device under /dev/fb0. It was certainly there some time ago, as it was passed through to my Plex LXC container for hardware accelerated transcoding (Intel Quicksync). The missing frame buffer device is currently causing Plex to be unable to use HW-accel transcoding.

Has something changed in the last kernel updates that would cause it to no longer create the frame buffer device(s)?
I'm on PVE 6.0-7 currently, Kernel 5.0.21-2-pve.

i965-va-driver packages are installed on all hosts and vainfo also shows the correct output, so the Intel GPU is being detected properly on the host. However I believe Plex needs the /dev/fb0 device to recognize and use the Intel Quicksync decoder.
 
Wouldn't Quick Sync need access to the iGPU directly, e.g. /dev/dri/* and not the framebuffer?

That said, a framebuffer device should still exist, or at least be possible to create. Do you see any output on a physical terminal of your PVE host? Could you try running the following commands from a virtual console (with no X server running):

Code:
rmmod i915
modprobe i915 modeset=1

and see if that creates a framebuffer device?
 

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