ACPI Throttling in Ubuntu

ACPI Throttling in Ubuntu I'm looking to throttle my cpu through the ACPI. I've read up on it, but I keep receiving permission denied statements. I have 8 available throttling states. Here are the outcomes of my atttempts:
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Guest [Entry]

"First do

cat /proc/acpi/processor/CPU0/throttling

Then use any of those states:

echo T4 > /proc/acpi/processor/CPU0/throttling

Also you can look in cat info if throttling is enabled."