Kernel 4.4.75 appears to have fixed the problem for C states. Package | Core | CPU 0 CPU 4 POLL 0.1% | POLL 0.0% | POLL 0.0% 0.0 ms 0.0% 0.0 ms C1E-SKL 1.4% | C1E-SKL 2.9% | C1E-SKL 3.5% 0.3 ms 2.3% 0.4 ms C3-SKL 0.9% | C3-SKL 1.1% | C3-SKL 1.5% 0.2 ms 0.8% 0.2 ms C6-SKL 8.4% | C6-SKL 12.6% | C6-SKL 19.0% 0.6 ms 6.1% 0.4 ms C7s-SKL 0.2% | C7s-SKL 0.5% | C7s-SKL 0.6% 1.5 ms 0.3% 0.6 ms C8-SKL 57.6% | C8-SKL 54.1% | C8-SKL 67.1% 1.7 ms 41.0% 3.2 ms C9-SKL 0.0% | C9-SKL 0.0% | C9-SKL 0.0% 0.0 ms 0.0% 0.0 ms C10-SKL 27.9% | C10-SKL 24.9% | C10-SKL 3.2% 4.4 ms 46.6% 8.0 ms | Core | CPU 1 CPU 5 | POLL 0.4% | POLL 0.0% 0.0 ms 0.8% 3.7 ms | C1E-SKL 1.4% | C1E-SKL 1.6% 0.2 ms 1.2% 0.4 ms | C3-SKL 1.4% | C3-SKL 1.5% 0.3 ms 1.4% 0.8 ms | C6-SKL 6.4% | C6-SKL 9.6% 0.6 ms 3.2% 0.5 ms | C7s-SKL 0.1% | C7s-SKL 0.2% 0.4 ms 0.0% 0.0 ms | C8-SKL 53.5% | C8-SKL 76.6% 2.4 ms 30.2% 2.4 ms | C9-SKL 0.0% | C9-SKL 0.0% 0.0 ms 0.0% 0.0 ms | C10-SKL 33.5% | C10-SKL 7.2% 4.6 ms 59.6% 9.7 ms | Core | CPU 2 CPU 6 | POLL 0.0% | POLL 0.0% 0.0 ms 0.0% 0.0 ms | C1E-SKL 0.6% | C1E-SKL 0.7% 0.1 ms 0.6% 0.2 ms | C3-SKL 0.6% | C3-SKL 1.0% 0.2 ms 0.2% 0.1 ms | C6-SKL 7.6% | C6-SKL 12.7% 0.5 ms 2.6% 0.7 ms | C7s-SKL 0.0% | C7s-SKL 0.0% 0.0 ms 0.0% 0.0 ms | C8-SKL 63.6% | C8-SKL 81.4% 2.2 ms 45.6% 3.5 ms | C9-SKL 0.0% | C9-SKL 0.0% 0.0 ms 0.0% 0.0 ms | C10-SKL 19.2% | C10-SKL 0.0% 0.0 ms 38.3% 4.8 ms | Core | CPU 3 CPU 7 | POLL 0.0% | POLL 0.0% 0.0 ms 0.0% 0.0 ms | C1E-SKL 0.6% | C1E-SKL 1.0% 0.2 ms 0.2% 0.7 ms | C3-SKL 0.5% | C3-SKL 0.8% 0.2 ms 0.2% 0.4 ms | C6-SKL 6.4% | C6-SKL 12.4% 0.6 ms 0.5% 0.5 ms | C7s-SKL 0.2% | C7s-SKL 0.0% 0.0 ms 0.4% 0.7 ms | C8-SKL 56.6% | C8-SKL 72.6% 2.1 ms 40.5% 5.2 ms | C9-SKL 0.0% | C9-SKL 0.0% 0.0 ms 0.0% 0.0 ms | C10-SKL 32.8% | C10-SKL 10.0% 6.0 ms 55.5% 7.5 ms carl@carl-5520:~$ sudo tlp stat -p --- TLP 0.8 -------------------------------------------- +++ Processor CPU Model = Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq = 3900000 [kHz] /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq = 3900000 [kHz] /sys/devices/system/cpu/cpu1/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq = 3900000 [kHz] /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq = 3900000 [kHz] /sys/devices/system/cpu/cpu2/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu2/cpufreq/scaling_min_freq = 800000 [kHz] /sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq = 800000 [kHz] /sys/devices/system/cpu/cpu3/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq = 800000 [kHz] /sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq = 800000 [kHz] /sys/devices/system/cpu/cpu4/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu4/cpufreq/scaling_min_freq = 800000 [kHz] /sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq = 800000 [kHz] /sys/devices/system/cpu/cpu5/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu5/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu5/cpufreq/scaling_min_freq = 800000 [kHz] /sys/devices/system/cpu/cpu5/cpufreq/scaling_max_freq = 800000 [kHz] /sys/devices/system/cpu/cpu6/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu6/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu6/cpufreq/scaling_min_freq = 800000 [kHz] /sys/devices/system/cpu/cpu6/cpufreq/scaling_max_freq = 3900000 [kHz] /sys/devices/system/cpu/cpu7/cpufreq/scaling_driver = intel_pstate /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor = powersave /sys/devices/system/cpu/cpu7/cpufreq/scaling_min_freq = 800000 [kHz] /sys/devices/system/cpu/cpu7/cpufreq/scaling_max_freq = 800000 [kHz] /sys/devices/system/cpu/intel_pstate/min_perf_pct = 100 /sys/devices/system/cpu/intel_pstate/max_perf_pct = 100 /sys/devices/system/cpu/intel_pstate/no_turbo = 0 x86_energy_perf_policy.cpu0 = powersave x86_energy_perf_policy.cpu1 = powersave x86_energy_perf_policy.cpu2 = powersave x86_energy_perf_policy.cpu3 = powersave x86_energy_perf_policy.cpu4 = powersave x86_energy_perf_policy.cpu5 = powersave x86_energy_perf_policy.cpu6 = powersave x86_energy_perf_policy.cpu7 = powersave /proc/sys/kernel/nmi_watchdog = 0 +++ Undervolting PHC kernel not available.