After suspend scaling_max_freq set to lowest. and some perfomance tweak

plumlis

I set CPU scaling_governor to schedutil for powersave.

echo schedutil > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
echo schedutil > /sys/devices/system/cpu/cpufreq/policy1/scaling_governor
echo schedutil > /sys/devices/system/cpu/cpufreq/policy3/scaling_governor

I found after laptop wake up from suspend.

/sys/devices/system/cpu/cpufreq/policy1/scaling_max_freq
/sys/devices/system/cpu/cpufreq/policy3/scaling_max_freq

will be set to lowest 408000. That makes laptop quite laggy.

Maybe its a bug in Kernel?

I made a workaroud.

sudo mkdir /usr/lib/systemd/system-sleep/
sudo vim /usr/lib/systemd/system-sleep/cpu_freq

File: /usr/lib/systemd/system-sleep/cpu_freq

#!/bin/sh
case $1/$2 in
  pre/*)
    echo "Going to $2..."
    # Place your pre suspend commands here, or `exit 0` if no pre suspend action required
    echo schedutil > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
    echo schedutil > /sys/devices/system/cpu/cpufreq/policy1/scaling_governor
    echo schedutil > /sys/devices/system/cpu/cpufreq/policy3/scaling_governor
    echo 1800000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq
    echo 408000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
    echo 2352000 > /sys/devices/system/cpu/cpufreq/policy1/scaling_max_freq
    echo 408000 > /sys/devices/system/cpu/cpufreq/policy1/scaling_min_freq
    echo 2256000 > /sys/devices/system/cpu/cpufreq/policy3/scaling_max_freq
    echo 408000 > /sys/devices/system/cpu/cpufreq/policy3/scaling_min_freq
    echo simple_ondemand > /sys/devices/platform/fb000000.gpu/devfreq/fb000000.gpu/governor
    ;;
  post/*)
    echo "Waking up from $2..."
    # Place your post suspend (resume) commands here, or `exit 0` if no post suspend action required
    sleep 2
    echo schedutil > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
    echo schedutil > /sys/devices/system/cpu/cpufreq/policy1/scaling_governor
    echo schedutil > /sys/devices/system/cpu/cpufreq/policy3/scaling_governor
    echo 1800000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq
    echo 408000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
    echo 2352000 > /sys/devices/system/cpu/cpufreq/policy1/scaling_max_freq
    echo 408000 > /sys/devices/system/cpu/cpufreq/policy1/scaling_min_freq
    echo 2256000 > /sys/devices/system/cpu/cpufreq/policy3/scaling_max_freq
    echo 408000 > /sys/devices/system/cpu/cpufreq/policy3/scaling_min_freq
    echo simple_ondemand > /sys/devices/platform/fb000000.gpu/devfreq/fb000000.gpu/governor
    ;;
esac

make it work

sudo chmod 755 /usr/lib/systemd/system-sleep/cpu_freq

george

@plumlis

Thank you for sharing.

plumlis

I just found something useful about improve cool pi laptop perfomance and efficiency.

https://github.com/ThomasKaiser/Knowledge/blob/master/articles/Quick_Preview_of_ROCK_5B.md#important-insights-and-suggested-optimisations

I tried and it works quite well.

Just compile kernel with CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y and use a conf file.

plumlis

Here is more about schedutil

https://github.com/ThomasKaiser/Knowledge/blob/master/articles/schedutil-and-EAS.md

Seems ondemand is better choice.

george

@plumlis
This method has been tried before, and as you said, the actual effect can be seen in the Ubuntu system. However, if it is a system with kylin and uos, it must always run in performance mode to run smoothly. We will re evaluate whether to update to the existing kernel configuration. Thank you for your suggestion.