hardware control.txt

Invert blue led
sudo nano /sys/devices/platform/pwmleds/leds/blue\:heartbeat/invert
Turn off
echo none > /sys/class/leds/blue\:heartbeat/trigger
Turn on
echo default-on > /sys/class/leds/blue\:heartbeat/trigger
Heartbeat (original state)
echo heartbeat > /sys/class/leds/blue\:heartbeat/trigger
See available led modes
cat /sys/devices/platform/pwmleds/leds/blue\:heartbeat/trigger
>none rc-feedback kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock mmc0 mmc1 timer oneshot [heartbeat] gpio cpu cpu0 cpu1 cpu2 cpu3 cpu4 cpu5 cpu6 cpu7 default-on transient rfkill-any rfkill-none
Brightness
echo 250 >  /sys/class/leds/blue\:heartbeat/brightness


CPU
Policy 0 (0-1-2-3) Small cores
Policy 4 (4-5-6-7) Big   cores
Set Core Governor:
echo powersave> /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
Check available Governors
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_governors

You can check the available list of governor and cpu speed under those nodes.
/sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies


https://wiki.odroid.com/odroid-xu4/application_note/software/cpufrequtils_cpufreq_govornor


GPU:
See GPU frequency
cat /sys/devices/platform/soc/11800000.gpu/devfreq/11800000.gpu/cur_freq
Set Governor
echo performance> /sys/devices/platform/soc/11800000.gpu/devfreq/11800000.gpu/governor
See available Governors
cat /sys/devices/platform/soc/11800000.gpu/devfreq/11800000.gpu/available_governors



CPU usage info
This sort of information is available under the /proc filesystem. See man proc.
    /proc/loadavg gives load averages;
    /proc/stat gives information on the amount of time the system spent in user/kernel mode, etc 
    /proc/[pid]/stat contains information on CPU times for the given process.

Memory usage:
 cat /proc/meminfo


Fan Control
/sys/devices/platform/pwm-fan/hwmon/hwmon0

After new 5.4 kernel: To Be Fixed
https://forum.odroid.com/viewtopic.php?t=29211
https://forum.odroid.com/viewtopic.php?f=99&t=43132