Hi Ian, We sometime get compatibility issue form different external device and even the HDMI cord(e.g. LP: #1890772).
To check if it's a external device issue, could you please help to do some test: 1. Will BIOS shows on external HDMI monitor if you plugged HDMI before booting up your machine? 2. If lower resolution make you HDMI monitor light up? - I saw you make it light up after manually xrander command, how if you change the resolution up and down? (I'm wondering if it related to LP: #1890772) ** Also affects: oem-priority Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1914670 Title: No HDMI detection To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1914670/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs