There was nothing useful in /var/log/{messages,syslog}. Xorg.log had
endlessly repeating lines shown in my first message that started this
bug. They repeated exactly when screen was blinking.-- Closing and opening lid sometimes leads to screen ENDLESSLY BLINKING https://bugs.launchpad.net/bugs/368946 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in ubuntu. -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
