What has been done here is incorrect.
The old "ondemand" script was modified so that if the intel_pstate
driver was being used, and therefore "ondemand" did not exist, it would
fall through to setting the "powersave" governor (refer to bug
#1314643). Note that "powersave" with the intel_pstate CPU frequency
scaling driver is NOT the same as "powersave" with the acpi-cpufreq CPU
frequency scaling driver.
The preferred governor with the intel_pstate driver is powersave. I'm
saying that this:
# more modern processors that support intel_pstate behave worse with
# ondemand/powersave and should use performance
if [ `cat /sys/devices/system/cpu/cpu$FIRSTCPU/cpufreq/scaling_driver` =
intel_pstate ]; then
echo 'CPU supports intel_pstate, keeping "performance"'
exit 0
fi
is incorrect.
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https://bugs.launchpad.net/bugs/1579278
Title:
Keep powersave CPU frequency scaling governor for CPUs that support
intel_pstate
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