I will follow up ASAP. The plot continues to thicken. I tried a different set of hardware today with a B43 chipset and it didn't seem to be effected. But that board has only DVI and VGA outputs whereas the effected board with a G43 chipset has DVI and HDMI. I'd been using HDMI so now I ran another range of tests using DVI on the effected board and was unable to reproduce.
So this appears to effect a very selective subset of 10 to 12 year old hardware. Must be Intel X4500 graphics with HDMI connection and possibly only the G43 chipset. So it's the absolute corneriest of corner issues I've ever encountered. And the workaround couldn't be any simpler - just remove the "quiet splash" boot parameter and all seems well (both boot to and logout to gdm3 screen). BTW ASAP may be rather slow in coming because I have a few medical procedures scheduled in the next few weeks. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1824588 Title: With AutomaticLogin enabled, logging out lands me on a black screen that's unresponsive to any keyboard input To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1824588/+subscriptions -- desktop-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/desktop-bugs