The log file does not seem to contain any clues. Does this happen also if the power manager is not running at all (xfce4-power-manager -q)?
Furthermore, I suggest that you test with a second user account. ** Changed in: xfce4-power-manager (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1815088 Title: power manager, display wakes up To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1815088/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs