Hanging on Shutdown | Thinkpad P50

Hello Folks - I just installed Qubes on a new (to me) P50 with the i7-6820 and 64gb ram.

So far, everything works smooth except when I shut down the machine.

On shutdown, the screen goes blank, but the backlight keyboard stays powered and it doens’t appear as if the system fully shutdown. A short press of the power button does nothing.

A long press of the power button does a forced power-down on the machine and then a short press will restart the machine.

Any ideas on why my machine is no longer fully shutting down?

Cheers!