Thanks. I still feel the first solution we should be aiming for is (another) new HDMI cable. If you've tried a few (without any adapters!) and none work then I would treat this as a proper kernel bug. The closest existing one I have found is:
https://bugs.freedesktop.org/show_bug.cgi?id=105601 ** Bug watch added: freedesktop.org Bugzilla #105601 https://bugs.freedesktop.org/show_bug.cgi?id=105601 ** No longer affects: xorg-server (Ubuntu) ** Also affects: linux via https://bugs.freedesktop.org/show_bug.cgi?id=105601 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1849484 Title: [X1 Carbon 7, i915, HDMI] Ultra-wide monitor recognized properly when plugged in only intermittently [Xorg only] To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1849484/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
