Quick command prompt question

[VaguelyRapt]

So I'm trying to get to all those power settings hidden deep inside the advanced settings that can't be easily reached or manipulated using my keyboard (such as the processor min/max state).

So far, I've got this:

powercfg -setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 7516b95f-f776-4464-8c53-06167f40cc99 aded5e82-b909-4619-9949-f5d71dac0bcb %1
powercfg -setdcvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 7516b95f-f776-4464-8c53-06167f40cc99 aded5e82-b909-4619-9949-f5d71dac0bcb %1
powercfg -s 381b4222-f694-41f0-9685-ff5bb260df2e

This sets the display brightness on the Balanced scheme. The thing is, I would like to set it on the current scheme, without needing to use any scheme in specific. I know the command powercfg -getactivescheme will return the GUID of the current scheme, which is exactly what I need, but how can I implement that in a batch file?

I tried:

[I]set var_currentscheme[/I] = powercfg -getactivescheme
powercfg -setacvalueindex [I]%var_currentscheme[/I]% 7516b95f-f776-4464-8c53-06167f40cc99 aded5e82-b909-4619-9949-f5d71dac0bcb %1

But %var_currentscheme% always comes up empty...