Here is the error message from guidance-power-manager when running from the terminal:
Warning: While setting SystemPowerManagement to True : org.freedesktop.Hal.Device.SystemPowerManagement.NotSupported: No powersave method found Warning: While setting SystemPowerManagement to False : org.freedesktop.Hal.Device.SystemPowerManagement.NotSupported: No powersave method found -- Screen goes dark when switching to/from external power https://bugs.launchpad.net/bugs/132521 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs