grg

This is strange. While the mainline kernel might not be as finely tuned as the legacy kernel, and the smaller boards are known to run hot, my experience doesn't seem to be typical.
 
These are my temperature readings from my OrangePi Zero v1.4 running the "next" build:
Time CPU load %cpu %sys %usr %nice %io %irq CPU C.St. 07:03:07: 240MHz 0.03 2% 1% 0% 0% 0% 0% 103.5°C 5/8 07:03:12: 240MHz 0.02 2% 1% 0% 0% 0% 0% 103.9°C 6/8 07:03:17: 240MHz 0.10 2% 1% 0% 0% 0% 0% 103.7°C 5/8 07:03:23: 240MHz 0.09 2% 1% 0% 0% 0% 0% 103.8°C 5/8 07:03:28: 240MHz 0.08 2% 1% 0% 0% 0% 0% 104.3°C 6/8  
Yet, it passes the "thumb test". The greatest reading I get with my cheap infrared thermometer is 42℃ but the average is around 37℃ (reading from both side).  It shuts down doing a simple "apt-get update".
 
Anyway, I'm just sharing for some extra context.

I'm powering a few Orange Pi Zeros, so I don't have any choice but to use USB for power (well, more or less). So, I spent some time searching for the right power adapter. It has to be at least 2A and only have one plug (to keep people from plugging in their phones). I thought I found the right product and purchased 20 of them.
 
I was having issues with not booting from the microSD card and was really lost as to why this problem kept popping up. Anyway, I thought to double check the power. I wasn't getting more than 700mA -- sometimes much less. And so, I decided to look deeper...
 
 

I'm powering a few Orange Pi Zeros, so I don't have any choice but to use USB for power (well, more or less). So, I spent some time searching for the right power adapter. It has to be at least 2A and only have one plug (to keep people from plugging in their phones). I thought I found the right product and purchased 20 of them.
 
I was having issues with not booting from the microSD card and was really lost as to why this problem kept popping up. Anyway, I thought to double check the power. I wasn't getting more than 700mA -- sometimes much less. And so, I decided to look deeper...
 
 

I'm powering a few Orange Pi Zeros, so I don't have any choice but to use USB for power (well, more or less). So, I spent some time searching for the right power adapter. It has to be at least 2A and only have one plug (to keep people from plugging in their phones). I thought I found the right product and purchased 20 of them.
 
I was having issues with not booting from the microSD card and was really lost as to why this problem kept popping up. Anyway, I thought to double check the power. I wasn't getting more than 700mA -- sometimes much less. And so, I decided to look deeper...