On Thu, Apr 29, 2021 at 1:25 PM Jonathan Billings billings@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