You can disable xfce4-power-manager by deactivating its autostart launcher (Settings Manager > Session and Startup > Application Autostart).
However, this bug seems to be triggered by your hardware. Use journalctl to check if there are any related system log messages. ** Changed in: xfce4-session (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/1454253 Title: external usb breaks suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfce4-session/+bug/1454253/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs