Kai-Heng Feng, I also noticed that by default the scaling driver used is
acpi-cpufreq and not p-state. I've read that p-state is favorable for
kernels >= 4.4. Is this something that is up to the user to decide or
should this be considered an incorrect default?
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 800 MHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.70 GHz, 2.60 GHz, 2.40 GHz,
2.30 GHz, 2.00 GHz, 1.90 GHz, 1.80 GHz, 1.70 GHz, 1.50 GHz, 1.40 GHz, 1.20 GHz,
1.10 GHz, 900 MHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 800 MHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 900 MHz (asserted by call to hardware).
cpufreq stats: 2.80 GHz:2.85%, 2.80 GHz:0.00%, 2.70 GHz:0.25%, 2.60
GHz:0.64%, 2.40 GHz:0.65%, 2.30 GHz:1.42%, 2.00 GHz:2.07%, 1.90 GHz:1.27%, 1.80
GHz:1.64%, 1.70 GHz:3.14%, 1.50 GHz:3.57%, 1.40 GHz:5.39%, 1.20 GHz:6.85%, 1.10
GHz:13.39%, 900 MHz:29.31%, 800 MHz:27.53% (2074191)
boost state support:
Supported: yes
Active: yes
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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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