I have a problem with pState on my Thinkpad L450 with Intel 5200U (broadwell) + SSD.
When I use pstate, the turbo mode is nearly always turned ON and my CPU fan is also always ON because cpu temp is about 60°C, while using acpi cpufreq in ondemand mode, my cpu frequency is around 0.50 to 2.1 GHz without turbo, thanks to that my cpu tempnature is only 40-45°C. Witch drives to less energy consumption and 4+ hours of battery life or 5.5+ hours (rarely 6+) when frequency is locked to 0.5 Ghz. But while using pstate, battery life is maximum 4 hours even in powersave mode.
- I have stopped using tlp, no big difference with or without it
- PowerTop reports nearly everything is "Bad" (i hate autosuspends, but that does not change the huge difference between pstate and acpi)
Some more details:
Distributor ID: Ubuntu Description: Ubuntu 15.04 Release: 15.04 Codename: vivid Linux version 3.19.0-26-generic (buildd@lcy01-12) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13) ) #28-Ubuntu SMP Tue Aug 11 14:16:32 UTC 2015
Any idea, what happens? Because in theory the pstate is intelligent enough to manager power correctly, but an always turbo ON state with always 2.2+ GHz is not too intelligent solution to manager power.