Because in my experience the probability of encountering a low quality cable or bad connection is quite high. Cheap cables are often the norm, not the exception. Sometimes you need to try a few till you find one that works reliably, depending on the resolution and depending on the devices involved.
Anyway, we have an upstream bug now so consider it a software bug: https://bugs.freedesktop.org/show_bug.cgi?id=105601 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
