Hi there !
I have a very strange thing going on here and I hope someone can help.
When I wake my machine up using wake on lan, and then shut it down, it first goes down like a normal shutdown (leds and fans go off) but after a few seconds it automatically starts. If I shut it down again, it works and it stays off.
If I start the machine using wake on lan and do a reboot and then a shutdown it will also shutdown and stay off. If I start the machine manually and then shutdown it will also correctly shutdown and stay off.
It only restarts automatically after a shutdown if the machine was started using wake on lan and not rebooted afterwards.
OS: Ubuntu 12.04 x64
Mainboard: MSI C847MS-E33 (latest bios)
In the bios under "wakeup event setup" I have set "wake up event by" to "bios". I have enabled "resume by PCI or PCI-E Device". All other events are disabled.
I am completely out of ideas with this one. If I wouldn't need the wake on lan functionality so badly, I would just turn it off and the problems were gone.
Would really appreciate any help ! I can post additional details or log files if requested.