@Carl, I burrowed a Precision 5520 and seems to be normal. Not sure what
happened on your system...
--- 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 = 800000 [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 = 800000 [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 = 3900000 [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 = 3900000 [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 = 3900000 [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 = 3900000 [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 = 3900000 [kHz]
/sys/devices/system/cpu/intel_pstate/min_perf_pct = 20
/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.
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/1672439
Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precision
5520
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