Comment 15 for bug 1946660

Martin's PPA version works for me on Jammy. See if your srcversion matches mine maybe?

redkrieg@cortex-1:~$ modinfo v4l2loopback
filename: /lib/modules/5.17.15-76051715-generic/extra/v4l2loopback.ko
license: GPL
author: Vasily Levin, IOhannes m zmoelnig <email address hidden>,Stefan Diewald,Anton Novikovet al.
description: V4L2 loopback video device
srcversion: B6031838219D91DE046F379
depends: videodev
retpoline: Y
name: v4l2loopback
vermagic: 5.17.15-76051715-generic SMP preempt mod_unload modversions
parm: debug:debugging level (higher values == more verbose) (int)
parm: max_buffers:how many buffers should be allocated (int)
parm: max_openers:how many users can open loopback device (int)
parm: devices:how many devices should be created (int)
parm: video_nr:video device numbers (-1=auto, 0=/dev/video0, etc.) (array of int)
parm: card_label:card labels for every device (array of charp)
parm: exclusive_caps:whether to announce OUTPUT/CAPTURE capabilities exclusively or not (array of bool)
parm: max_width:maximum frame width (int)
parm: max_height:maximum frame height (int)
redkrieg@cortex-1:~$ ls -hal /lib/modules/5.17.15-76051715-generic/extra/v4l2loopback.ko
-rw-r--r-- 1 root root 91K Jul 15 10:09 /lib/modules/5.17.15-76051715-generic/extra/v4l2loopback.ko