# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-2.6.35-24-generic root=UUID=66817f18-a5c7-4d9e-8a29-3220974cb618 ro nolapic_timer quiet splash
# dmesg | grep idle
[    0.000000] 	RCU dyntick-idle grace-period acceleration is enabled.
[    0.004572] using mwait in idle threads.
[    0.413448] intel_idle: MWAIT substates: 0x20220
[    0.413455] intel_idle: v0.4 model 0x1C
[    0.413460] intel_idle: lapic_timer_reliable_states 0x6
[    0.413477] Marking TSC unstable due to TSC halts in idle states deeper than C2
[    0.415576] ACPI: acpi_idle yielding to intel_idle
[    0.655957] cpuidle: using governor ladder
[    0.656234] cpuidle: using governor menu
# grep . /sys/devices/system/cpu/cpu*/cpuidle/*/*
/sys/devices/system/cpu/cpu0/cpuidle/state0/desc:CPUIDLE CORE POLL IDLE
/sys/devices/system/cpu/cpu0/cpuidle/state0/latency:0
/sys/devices/system/cpu/cpu0/cpuidle/state0/name:C0
/sys/devices/system/cpu/cpu0/cpuidle/state0/power:4294967295
/sys/devices/system/cpu/cpu0/cpuidle/state0/time:15170107
/sys/devices/system/cpu/cpu0/cpuidle/state0/usage:1386
/sys/devices/system/cpu/cpu0/cpuidle/state1/desc:MWAIT 0x00
/sys/devices/system/cpu/cpu0/cpuidle/state1/latency:1
/sys/devices/system/cpu/cpu0/cpuidle/state1/name:ATM-C1
/sys/devices/system/cpu/cpu0/cpuidle/state1/power:1000
/sys/devices/system/cpu/cpu0/cpuidle/state1/time:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/usage:0
/sys/devices/system/cpu/cpu0/cpuidle/state2/desc:MWAIT 0x10
/sys/devices/system/cpu/cpu0/cpuidle/state2/latency:20
/sys/devices/system/cpu/cpu0/cpuidle/state2/name:ATM-C2
/sys/devices/system/cpu/cpu0/cpuidle/state2/power:500
/sys/devices/system/cpu/cpu0/cpuidle/state2/time:0
/sys/devices/system/cpu/cpu0/cpuidle/state2/usage:0
/sys/devices/system/cpu/cpu0/cpuidle/state3/desc:MWAIT 0x30
/sys/devices/system/cpu/cpu0/cpuidle/state3/latency:100
/sys/devices/system/cpu/cpu0/cpuidle/state3/name:ATM-C4
/sys/devices/system/cpu/cpu0/cpuidle/state3/power:250
/sys/devices/system/cpu/cpu0/cpuidle/state3/time:0
/sys/devices/system/cpu/cpu0/cpuidle/state3/usage:0
/sys/devices/system/cpu/cpu1/cpuidle/state0/desc:CPUIDLE CORE POLL IDLE
/sys/devices/system/cpu/cpu1/cpuidle/state0/latency:0
/sys/devices/system/cpu/cpu1/cpuidle/state0/name:C0
/sys/devices/system/cpu/cpu1/cpuidle/state0/power:4294967295
/sys/devices/system/cpu/cpu1/cpuidle/state0/time:14183385
/sys/devices/system/cpu/cpu1/cpuidle/state0/usage:1308
/sys/devices/system/cpu/cpu1/cpuidle/state1/desc:MWAIT 0x00
/sys/devices/system/cpu/cpu1/cpuidle/state1/latency:1
/sys/devices/system/cpu/cpu1/cpuidle/state1/name:ATM-C1
/sys/devices/system/cpu/cpu1/cpuidle/state1/power:1000
/sys/devices/system/cpu/cpu1/cpuidle/state1/time:0
/sys/devices/system/cpu/cpu1/cpuidle/state1/usage:0
/sys/devices/system/cpu/cpu1/cpuidle/state2/desc:MWAIT 0x10
/sys/devices/system/cpu/cpu1/cpuidle/state2/latency:20
/sys/devices/system/cpu/cpu1/cpuidle/state2/name:ATM-C2
/sys/devices/system/cpu/cpu1/cpuidle/state2/power:500
/sys/devices/system/cpu/cpu1/cpuidle/state2/time:0
/sys/devices/system/cpu/cpu1/cpuidle/state2/usage:0
/sys/devices/system/cpu/cpu1/cpuidle/state3/desc:MWAIT 0x30
/sys/devices/system/cpu/cpu1/cpuidle/state3/latency:100
/sys/devices/system/cpu/cpu1/cpuidle/state3/name:ATM-C4
/sys/devices/system/cpu/cpu1/cpuidle/state3/power:250
/sys/devices/system/cpu/cpu1/cpuidle/state3/time:0
/sys/devices/system/cpu/cpu1/cpuidle/state3/usage:0