My computer doesn't shutdown completely

[Ralf Mardorf]

PS:
>My mobo is an ASUS M2A-VM HDMI with an AMD Athlon X2 dual-core BE-2350.
>Shutdown works without issues and finishes with power off.
>
>[weremouse at moonstudio ~]$ printf "Linux:          ";uname
>-rm;lsb_release -dc Linux:          4.2.0-22-lowlatency x86_64
>Description:	Ubuntu 15.10
>Codename:	wily

There were also no issues with previous versions of the Ubuntu's
lowlatency kernel and there are also no issues with 3.10.61-rt65, not
from the repositories.

[weremouse at moonstudio ~]$ ls -hGg /boot/vmlinuz-*
-rw------- 1 3.9M Aug 23 03:22 /boot/vmlinuz-3.10.61-rt65-1-moonstudio
-rw------- 1 6.6M Dec 18 03:14 /boot/vmlinuz-4.2.0-22-lowlatency
lrwxrwxrwx 1   27 Dec 20 13:25 /boot/vmlinuz-lowlatency -> vmlinuz-4.2.0-22-lowlatency