Also related?
https://bugzilla.kernel.org/show_bug.cgi?id=90421
https://askubuntu.com/questions/582805/high-cpu-frequency-at-idle
Workaround from that bug: Force low power state:
shevek@raven:/sys/devices/system/cpu/intel_pstate$ cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 500 MHz - 3.20 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 500 MHz and 2.80 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 3.19 GHz.
boost state support:
Supported: yes
Active: yes
shevek@raven:/sys/devices/system/cpu/intel_pstate$ sudo cpupower frequency-set
-g powersave
Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
shevek@raven:/sys/devices/system/cpu/intel_pstate$ cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 500 MHz - 3.20 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 500 MHz and 2.80 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz.
boost state support:
Supported: yes
Active: yes
shevek@raven:/sys/devices/system/cpu/intel_pstate$ grep MHz /proc/cpuinfo
cpu MHz : 1300.000
cpu MHz : 1405.726
cpu MHz : 1200.062
cpu MHz : 1229.617
Now it's scaled down again.
** Bug watch added: Linux Kernel Bug Tracker #90421
http://bugzilla.kernel.org/show_bug.cgi?id=90421
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https://bugs.launchpad.net/bugs/1535426
Title:
CPU runs at high speed after upgrade
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