Power of option does not work

I have installed titan skin on my kodi runing on Archlinux and the other day I installed titan on kodi with Windows 7, I never used the powroff option since I’m using titan, the other day, my bother told me that the Power Off option does not work as it should,(close kodi and) power of the PC).
then I tested the power off button on my kodi, to check if it was some Winkrp trouble, but in my kodiArch it just exited kodi, never powered of

didn’t tested the stand alone DE version, just kodi runing on Gnome or KDE DE.

Kodi 16.1
Titan 3.6.78

I have to add that ith Amber skin the power Off option worked in both OS