Board not detected but drivers loaded properly

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Sylvain Fabre

  • Posts: 3
  • Joined: Wed Dec 02, 2015 2:19 pm

Board not detected but drivers loaded properly

PostThu Apr 07, 2022 8:11 am

Hi all,

On a fresh new computer, I have a Decklink Duo 2. I installed drivers and upgraded the decklink firmware with DesktopVideoUpdateTool.

Then I use the SDK to detect and list the board with the simple DeviceList sample code : it does not detect any board. But the DesktopVideoUpdateTool is still listing the board properly.
I have also the /dev/blackmagic/ioX files, hence I guess the driver is properly loaded and the board is detected.

Drivers : 12.2.2, SDK : 12.2.2, Kernel : 5.3.18

Any ideas on what is going on ?
Thanks !
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Cameron Nichols

Blackmagic Design

  • Posts: 442
  • Joined: Mon Sep 04, 2017 4:05 am

Re: Board not detected but drivers loaded properly

PostSun Apr 10, 2022 11:41 pm

Hi Sylvain,

If the driver is not loaded, check that the module is built for the running kernel:
Code: Select all
$ dkms status -m blackmagic-io -k `uname -r`
If the driver is installed for the active kernel then you can load with:
Code: Select all
$ sudo modprobe blackmagic-io
If the driver is not installed, you can build and install against the headers for the running kernel with:
Code: Select all
$ sudo dkms build -m blackmagic-io -v 12.2.2a6
$ sudo dkms install -m blackmagic-io -v 12.2.2a6 --all
Please let me know if this helps.

Regards
Cameron
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MowKow

  • Posts: 3
  • Joined: Wed Apr 13, 2022 12:14 pm
  • Real Name: Winand Appelhoff

Re: Board not detected but drivers loaded properly

PostWed Apr 13, 2022 12:20 pm

I can confirm this ( decklink duo 2 & Mini Recorder 4K )

sometimes after a reboot the kernel module is not getting loaded (kernel version unchanged)
reboot fixes this

in very rare cases the card doesn't even appear using lspci, so this might be a firmware issue (?)
power off/on fixes this

12.2.2 drivers & SDK

happened with different kernel versions ( 5.11.0.x & 5.13.0.x )

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