Hello, Can you try the following debug command when you plug the HDMI monitor?
1. check if udev event emit from kernel $ udevadm monitor -s drm 2. check if the connector change status $ cat /sys/class/drm/card0-*/status 3. try to dump the display info # cat /sys/kernel/debug/dri/0/i915_display_info 4. If the driver thinks no display attached upload /sys/kernel/debug/dri/0/i915_vbt to this bug, I can check if vbios is revised, since the BIOS version is different from what we certified. The driver won't change state, if it can't retrieve EDID properly. Would like to confirm if kernel did aware a output is attached. Thanks, -- 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
