Need Help with Blackmagic Decklink Mini Monitor 4K Installation on Fedora 40/41

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Hi everyone,

I’m facing issues getting my Blackmagic Decklink Mini Monitor 4K card working on Fedora, and I could really use some help. Here’s what I’ve tried:

  1. On Fedora 41 with Secure Boot enabled, I followed all the instructions for the Desktop Video drivers. The driver loaded (checked with lsmod | grep Blackmagic), and the card was detected by lspci, but I kept getting errors related to CET/IBT. Tried booting with ibt=off and setting SELinux to permissive, but no luck. Kernel 6.11 was used.
  2. I switched to Fedora 40 because it is officially supported by Blackmagic (according to the README of Desktop Video version 14.3a5). After disabling Secure Boot and installing kernel 6.8.5, the card works with driver version 12.8 via a patch (since DKMS couldn’t build with earlier kernels). With driver 14.x.x, DKMS builds correctly, but it still doesn’t work unless I upgrade to kernel 6.11.10.
  3. The real issue, though, is that kernel-devel for kernel 6.8.5 isn’t available in Fedora 40 (it requires kernel 6.11.10), so I can’t build the module for my kernel. The same problem occurs with akmod-nvidia—I can’t install the necessary kernel-devel to make it work without upgrading the kernel.

I know I’m working with proprietary drivers, and support is limited on Linux, but as a videomaker (not a Linux expert), I’m stuck. I’ve tried everything I can think of, and I’m willing to reinstall Fedora as many times as needed to get it working.

Any advice or suggestions from the Fedora community would be greatly appreciated!

Thanks a lot!
David