I'm using the backports kernel and have no issues building v4l2loopback-dkms. I've not had a failure on any kernel.
alex@Enterprise:~$ sudo dkms status nvidia/615.71.09, 6.12.95+deb13-amd64, x86_64: installed nvidia/615.71.09, 7.1.13+deb13-amd64, x86_64: installed nvidia/615.71.09, 7.1.8+deb13-amd64, x86_64: installed v4l2loopback/0.15.4, 6.12.95+deb13-amd64, x86_64: installed v4l2loopback/0.15.4, 7.1.13+deb13-amd64, x86_64: installed v4l2loopback/0.15.4, 7.1.8+deb13-amd64, x86_64: installed alex@Enterprise:~$ uname -r 7.1.13+deb13-amd64 -- Cheers, Alex
