Reboot after shutdown

[Colin Law]

On 13 November 2016 at 09:35, Frank Vanoni <mailinglist at linuxista.com>
wrote:

> Hi Ubuntu users
>
> Here is the situation:
>
> Two brand new Dell PowerEdge T20 servers (Intel Xeon CPU E3-1225 v3 @
> 3.20GHz), on each a fresh install of the latests Ubuntu 16.04.1 LTS
> server 16.04 (4.4.0-47-generic).
> Nothing fancy is installed, just Samba, Isc-DHCP-server and Bind.
>
> Problem: when a "shutdown -h now" command is issued, the machine
> correctly turns off (including hard discs, CPU fan, PS fan, etc.).
> About 3 seconds later, the machine restarts again.
>
> I googled and followed the various recipes (acpi=force or acpi=noirq on
> Grub, install acpid, install laptop-mode-tools, ....), unfortunately
> with no joy.
>
> What I also found out:
>
>
> - If "Wake on LAN" is enabled and "USB3" is disabled on BIOS, the
> machines turn off correctly.
>
> - If "Wake on LAN" is disabled and "USB3" is enabled on BIOS, the
> machines turn off correctly.
>
> - If "Wake on LAN" and "USB3" are both enabled, the machines reboot
> after shutdown
>

First I would check that you have the latest motherboard firmware. Upgrade
it if not.
The fact that the machine is new does not mean the firmware will be up to
date.

Colin
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