I have tried. I installed and uninstalled the latest version of Blackmagic Desktop Video multiple times and even tried going back a version. The DeckLink_Driver.kext is showing up in Library>Extensions but the app still is not detecting a device.
Anything else you'd recommend trying?
View attachment 542750
It certainly is.
Thanks again for all of your help.
I had loads of difficulties getting BM drivers to work in Big Sur (haven’t tried yet in Monterrey)…it’s also all over the BMD user forums, even on real macs. Interestingly, I didn’t have as much difficulty on my z390m system.
Anyway, there’s loads of things to try with approving the installer, deleting the failed .kexts after a failed install (at some point BM changed the driver format type (I’ll have to look that bit up and get back to you) but for me, permanently turning off SIP seemed to be the only way.
Here is “one” explanation of what to try copy/pasted, but, again, didn’t work for me…only keeping SIP off worked:
1. Uninstall Video Desktop using the uninstall program.
2. Boot into Recovery Mode (command-r)
3. Open Terminal to disable SIP: At the prompt enter this command: csrutil disable
4. You will get a message that SIP has been disabled.
5. Then enter reboot.
6. Once you reboot, open Terminal and force delete the kernal extensions. In my case, the commands looked like this for the three extensions:
sudo rm -rf /Library/StagedExtensions/Library/Extensions/Blackmagic_Multibridge_Driver.kext
sudo rm -rf /Library/StagedExtensions/Library/Extensions/BlackmagicIO.kext
sudo rm -rf /Library/StagedExtensions/Library/Extensions/BlackmagicUsbIO.kext
7. After deleting the extensions, I rebooted in Recovery Mode (command-r)
8. Open Terminal to enable SIP: At the prompt enter this command: csrutil enable
9. Then enter reboot.
9. Once rebooted, install Video Desktop. I used the Beta, 12.0b1
10. If Desktop Video then says "No Desktop Device Detected" you have to go to System Preferences>Security & Privacy>General and the select "App Store and identified developers” and then “Allow” Blackmagic Design in the pop-up window. You might have to restart after that.
11. <NEW> If this STILL doesn't work, have a look in you Library/Extensions, and verify you have the "BlackmagicIO.kext" installed. If it is not there, run this command in terminal:
sudo mv /Library/Application\ Support/Blackmagic\ Design/Blackmagic\ DeckLink/Signed\ Extensions/BlackmagicIO.kext /Library/Extensions, then reboot.