intel_pstate does not work

[jorgelaranjo]

[x] I've read and accepted the Bug Reporting Howto [x] I've provided all required tlp-stat outputs via Gist (see below)

Describe the bug Laptop Lenovo E14 gen4 Intel has tlp and the following setup

CPU model      = 12th Gen Intel(R) Core(TM) i7-1255U
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver    = intel_pstate
/sys/devices/system/cpu/intel_pstate/status            = active
/sys/devices/system/cpu/intel_pstate/min_perf_pct      =  10 [%]
/sys/devices/system/cpu/intel_pstate/max_perf_pct      =  30 [%]
/sys/devices/system/cpu/intel_pstate/no_turbo          =   1
/sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost =   0
/sys/devices/system/cpu/intel_pstate/turbo_pct         = (not available) 
/sys/devices/system/cpu/intel_pstate/num_pstates       = (not available)

It would be expected that max frequency to be 30% of 4,800 which is 1,440 MHz as shown

/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_available_governors = performance powersave
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq  =   400000 [kHz]
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq  =  1410000 [kHz]

However a quick check of currency frequencies on CPU reports values closer to max speed without boost, of 2,600MHz

Expected behavior

Max cpu speed to be the same asscaling_max_freq

To Reproduce

Steps to reproduce the unexpected behavior:

1. Does the problem occur on battery or AC or both? Battery
2. Actions to reproduce the behaviour Setup TLP and reboot

Related Issues

• 693

• 677

[linrunner]

At the very least I expect people to provide the full output of

sudo tlp-stat 

as required by the issue template. But I'll make an assumption for now.

/sys/devices/system/cpu/intel_pstate/max_perf_pct = 30 [%]

If CPU_MAX_PERF_ON_BAT=30 is your actual setting, then TLP has correctly written it to the _intelpstate driver as your abbreviated output shows. If _intelpstate does not work as you expect it to, then you should discuss this with the _intelpstate kernel developers. For the TLP issue tracker this is out of scope.

[jorgelaranjo]

Closing as validated as not being a bug in TLP

[jorgelaranjo]

Works as expected if intel_pstate in passive mode. Does not work if intel_pstate in active mode, which is expected according to documentation.

Power savings seem better in active mode.