Based on this, looks like it wont enable hibernation mode for me anyway.
C:\Users>powercfg -h on
Unable to perform operation. An unexpected error (0x65b) has occurred: Function failed during execution.
Ok, sounds like I dont want to enable hibermation/Fast Statup, I'm happy with that.
Just seems odd that I cant if I wanted to. I thought most modern motherboards/drivers would support it.
Unless I have an odd BIOS setting somewhere.
Looks like its definitely off. Thanks for confirming.