See what capabilities are available:
box:/# cat /proc/acpi/processor/CPU0/power
active state: C2
max_cstate: C8
bus master activity: 00000000
states:
C1: type[C1] promotion[C2] demotion[--] latency[000] usage[00002220]
*C2: type[C2] promotion[--] demotion[C1] latency[090] usage[00152026]
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