I can confirm this bug. I just upgraded my home server from 12.04.5 LTS to 14.04.1 LTS and now the system always reboots after a poweroff / shutdown -h command. The only way to shut the system off is to press the power button when it's in the POST phase.
If I issue a "poweroff" command the server shuts down and then instantly reboots. I tried to set acpi=force in /etc/default/grub but this did not help. With 12.04 I had no problem with poweroff and I used to use Wake On LAN to boot up my server whenever a client needs it. Fortunately I had cloned my old system disk before the upgrade so I was able to revert to 12.04 without a fuss. As expected the problem is not there with the 12.04 disk. Thus it is not the hardware or BIOS which causes the problem but definetely something in 14.04. Was there possibly some major change in 14.04 with respect to ACPI behaviour? Ubuntu 14.04 is at its server release .1 but with not being able to put my home server to sleep it proves to be totally useless to me. P.S. My Mobo is an MSI P9D-X with a Xeon CPU E3-1230L v3 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346269 Title: Ubuntu 14.04 won't shut down (reboots) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1346269/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
