Just got a new Rpi gen #3, which has default /boot/config.txt has
temp_limit=85
I then turn that down to
temp_limit=70
after a reboot, it works. If you don't know how to stress the Pi processor, and how to read the temperature of that, feel free to clone my simple github code (shell script) and run that.
https://github.com/Fisherworks/raspberry_pi_stress
I thought it's dynamic lowering frequency which can limit the temperature of Rpi - but using the following command, it shows the frequency is still 1200000, which means it's running on full power.
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
Now the question is - How Raspbian control the temperature of BCM processor without reducing the freq?
Try this instead.
vcgencmd measure_clock arm
And you can check if it is being(has been), throttled, capped, or in under-voltage by this.
vcgencmd get_throttled
https://retropie.org.uk/forum/topic/2295/runcommand-warning-if-voltage-temperature-throttling
return code is like 0x50005.
bit pattern:
update: I know the command you used;
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
But it seems not used anymore and I found the new one being used;
sudo cat /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq
You can use it or vcgencmd.