I have ran into a similar issue. My Lenovo Flex 15-2 is currently running Debian Jessie amd64 Stable Release. When I issue the shutdown command either via the menus in gnome or gym, it goes through the process of shutting down and powers off. Approximately 5 seconds later, the laptop powers back up and continues with the booting process via grub. Mind you the computer has not been touched since issuing the shutdown command. The only way I have been able to get the laptop to shutdown and power down successfully is by having a USB mouse connected. I’m thinking that the installation has some corrupted files and I am thinking that I just need to do a clean wipe and reinstall, but I’m hoping that it’s something much simpler. I ask for advice to which direction to go as I am a novice.
