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#1
Just make up your own power profile. This happens when ACPI for the motherboard is not installed.
The fact you had problems in 8.1 makes me think you need to either change some BIOS settings or install a motherboard specific driver from the manufacturer rather than the generic Windows ones.
Some drivers for various ASUS boards don't get installed until you install some of their motherboard 'management' type apps that you think you don't need/want.
Oops, I didn't notice it was a tablet.
There are a couple of registry hacks you can try.
First, go to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power
Change CsEnabled from 1 to 0 and reboot.
If this gives you no joy then you can show individual power options by adding a 32bit DWORD value with the name 'Attributes' and a value of '2' to any of the keys under: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\