#2 C-states supported, but never used

[Anonymous]

Description of problem: My system supports C-states C0,1,2, and 3 but only C0
and C1 are used.

# cat /proc/acpi/processor/CPU0/info
processor id: 0
acpi id: 0
bus mastering control: yes
power management: yes
throttling control: no
limit interface: no

# cat /proc/acpi/processor/CPU0/power
active state: C0
max_cstate: C8
maximum allowed latency: 2000000000 usec
states:
C1: type[C1] promotion[--] demotion[--] latency[000]
usage[13629061] duration[00000000000000000000]
C2: type[C2] promotion[--] demotion[--] latency[005]
usage[00000000] duration[00000000000000000000]
C3: type[C3] promotion[--] demotion[--] latency[020]
usage[00000000] duration[00000000000000000000]

This was reported in Fedora as https://bugzilla.redhat.com/show_bug.cgi?id=570950