When I choose power down in the KDE menu, my machine very often gets rebooted. That may be a general Linux issue since I tried command line "sudo shutdown now -P" and it got rebooted as well. Reproducible: Sometimes Steps to Reproduce: 1. Go to the main menu launcher. 2. Select "Shut down". 3. Press "Turn off computer". Actual Results: The computer get rebooted sometimes (~ 40% of times). Expected Results: The computer should be powered off. PC: Lenovo V580c. Model name: 20160.
Looks like a hardware/driver issue.