On Thu, Apr 29, 2021 at 1:25 PM Jonathan Billings <billi...@negate.org> wrote:
>
> > Thanks, Jonathan. I meanwhile installed the v4l2loopback-dkms package from
> >
> > https://copr.fedorainfracloud.org/coprs/sentry/v4l2loopback/
> >
> > and reboot, but the problem persists.
>
> I'd check the dkms build logs in:
>
> /var/lib/dkms/v4l2loopback/${V4L2LOOPBACK_VERSION}/build/make.log
>
> (replace ${V4L2LOOPBACK_VERSION} with the version you have installed,
> it looks like it is 0.12.5 from the repo)
>
> Looking at the issues in the upstream git repo, it appears to be an
> issue with the version of GCC not matching the one used to build the
> kernel.  The suggestions were to run 'dnf downgrade gcc' before
> building.  Not sure if that helps.
>
> See this closed issue:
> https://github.com/umlaeute/v4l2loopback/issues/410

Thanks, Jonathan. Can you detect any problem in the make.log:

------------------------------
# more  
/var/lib/dkms/v4l2loopback/0.12.5/5.11.16-300.fc34.x86_64/x86_64/log/make.log
DKMS make.log for v4l2loopback-0.12.5 for kernel 5.11.16-300.fc34.x86_64 (x86_64
)
Thu Apr 29 09:21:31 AM WEST 2021
Building v4l2-loopback driver...
make -C /lib/modules/5.11.16-300.fc34.x86_64/build M=/var/lib/dkms/v4l2loopback/
0.12.5/build modules
make[1]: Entering directory '/usr/src/kernels/5.11.16-300.fc34.x86_64'
  CC [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.o
  MODPOST /var/lib/dkms/v4l2loopback/0.12.5/build/Module.symvers
  CC [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.mod.o
  LD [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.ko
  BTF [M] /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.ko
Skipping BTF generation for /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback
.ko due to unavailability of vmlinux
make[1]: Leaving directory '/usr/src/kernels/5.11.16-300.fc34.x86_64'
#
------------------------------

Paul
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