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I finally had time to investigate the issue. It looks like that as of 11.5, the DesktopVideoHelper.service has to be running for the capture card to work properly.

I will try -lts eventually if I can't get the video feed to show up in CapturePreview

it was the firmware! I wasn't able to locate the BlackmagicFirmwareUpdater application from the module install (but I did see the man page), so I installed the 11.7 driver on MacOS and updated the card firmware there, and then moved the card back to the new computer, and it now BlackmagicDesktopVideoSetup sees the board! great! no video coming through yet in CapturePreview, but the board info is there, so this seems promising.

thanks for all your help!

ok sure, I can try -lts also.

lspci -k reports:

24:00.0 Multimedia video controller: Blackmagic Design DeckLink Duo 2
    Subsystem: Blackmagic Design DeckLink Duo 2
    Kernel driver in use: blackmagic-io
    Kernel modules: blackmagic_io

looking at dmesg I see a warning about the card's firmware version being older than the driver, so maybe I will try updating the firmware first -- and then try -lts if that doesn't work. will report back -- cheers! rama

Could you try the module with -lts kernel ?

You can also look for errors related to blackmagic and blackmagic-io in dmesg. Also make sure the card uses the correct driver with lspci -k.

I just also tested the card on MacOS and it is working there, so the hardware seems fine.

ok great thank you, so the module seems installed, and the DesktopVideoHelper.service is starting on load. I just did PCI refresh, with a power cycle in between to see if that might force it to load something new, but no luck.

And now just tried loading BlackmagicDesktopVideoSetup then rebooting and loading BlackmagicDesktopVideoSetup again, but also no improvement yet.

when I try to use it with the BlackmagicDesktopVideoSetup app or SDK examples, it says No Desktop Video Devices were found.

CapturePreview loads, but the input ports are not listed.

I have an active SDI signal attached to the card as well.

Any other ideas that I might try?

modprobe returning 0 and displaying nothing is the sign it loaded the module correctly.

If modules are correctly loaded then launch BlackmagicDesktopVideoSetup and should list your card. Otherwise reboot to make sure everything get loaded correctly and try BlackmagicDesktopVideoSetup again.

sorry, you're right I had mis-typed it, I was just editing my last comment when you replied.

sudo modprobe blackmagic and sudo modprobe blackmagic-io both return empty

but modinfo sees both blackmagic and blackmagic-io as installed, not sure what to try next

have to run to a meeting, but hoping to get this working! maybe I will try reseating the pci board.

Hmm, if dkms reports blackmagic and blackmagic-io as installed then you should be able to load them (and they should load automatically at boot). You don't have anything to copy, dkms handles that for you.

Just to be sure, are you typing the exact command in your previous message or are you typing sudo modprobe blackmagic and sudo modprobe blackmagic-io ? Modprobe expects a single module name so you cannot load both modules like that in a single command.

ok, I see that it's there in /lib/modules/5.10.7-arch1-1/kernel/drivers hmm

sudo modprobe blackmagic and sudo modprobe blackmagic-io both return empty

but modinfo sees both blackmagic and blackmagic-io as installed, not sure what to try next