Sorry. I had connected the device to a second (newer hardware) notebook computer with same Lubuntu to check, whether it is a problem of just this particular machine or a common problem.
xrandr2 attached. The Lubuntu monitor settings tool names the HDMI screen „BMD HDMI”, (BMD seems to mean Blackmagic Design) and thus seems to recognize the device. ** Attachment added: "xrandr2.txt" https://bugs.launchpad.net/ubuntu/+bug/1910537/+attachment/5450874/+files/xrandr2.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1910537 Title: incorrect audio-EDID on HDMI, blocking audio transmission over HDMI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1910537/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs