Eu tenho meu /etc/default/tlp set para que, quando estiver em bateria, a CPU seja dimensionada entre 30% e 60%. Executando tlp-stat -p (saída abaixo), posso ver que essas configurações estão sendo reconhecidas. No entanto, os intervalos reais de CPU mostrados são 1170MHz e 2340MHz. Por que isso acontece?
--- TLP 1.0 --------------------------------------------
+++ Processor
CPU model = Intel(R) Core(TM) i7-7600U CPU @ 2.80GHz
/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_available_governors = performance powersave
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq = 1170000 [kHz]
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq = 2340000 [kHz]
/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference = balance_power
/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences = default performance balance_performance balance_power power
/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_available_governors = performance powersave
/sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq = 1170000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq = 2340000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/energy_performance_preference = balance_power
/sys/devices/system/cpu/cpu1/cpufreq/energy_performance_available_preferences = default performance balance_performance balance_power power
/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_available_governors = performance powersave
/sys/devices/system/cpu/cpu2/cpufreq/scaling_min_freq = 1170000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq = 2340000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/energy_performance_preference = balance_power
/sys/devices/system/cpu/cpu2/cpufreq/energy_performance_available_preferences = default performance balance_performance balance_power power
/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_available_governors = performance powersave
/sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq = 1170000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq = 2340000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/energy_performance_preference = balance_power
/sys/devices/system/cpu/cpu3/cpufreq/energy_performance_available_preferences = default performance balance_performance balance_power power
/sys/devices/system/cpu/intel_pstate/min_perf_pct = 30 [%]
/sys/devices/system/cpu/intel_pstate/max_perf_pct = 60 [%]
/sys/devices/system/cpu/intel_pstate/no_turbo = 1
/sys/devices/system/cpu/intel_pstate/turbo_pct = 34 [%]
/sys/devices/system/cpu/intel_pstate/num_pstates = 36
x86_energy_perf_policy.cpu0 = powersave
x86_energy_perf_policy.cpu1 = powersave
x86_energy_perf_policy.cpu2 = powersave
x86_energy_perf_policy.cpu3 = powersave
/sys/module/workqueue/parameters/power_efficient = Y
/proc/sys/kernel/nmi_watchdog = 0
+++ Undervolting
PHC kernel not available.
Seu processador é mostrado como CPU Intel (R) Core (TM) i7-7600U a 2.80GHz, que possui uma frequência turbo máxima de 3,90GHz. Como o turbo está habilitado, 3,90 GHz é igual a 100% da freqüência da CPU e:
3,90 * 60% = 2,34 GHz.
3,90 * 30% = 1,17 GHz.