What is the function of the blinking green light?

aegrotatio

I noticed that, at least when using Armbian, the blinking green light has a rythm that looks like a heartbeat.  When the system gets hotter it "beats" faster.  Or, maybe it's when the system gets busier it "beats" faster.

Is this a function of the board's heat sensors, or is this the operating system that's blinking it?  When I shut down and restart a system that feels hot to the touch, the "beats" still continue to blink more quickly which seems to indicate that it's a function of how hot the board and/or CPU are.

Thanks in advance for any ideas and information.

phelum

The heartbeat cadence is due to a LED trigger called 'heartbeat'.  I don't think it really means anything and I don't think the frequency is related to system load or temperature.

But I could be wrong.  Perhaps someone will chip in with more details.

Cheers,
Steven

aegrotatio

phelum replied at 2016-5-10 14:35
The heartbeat cadence is due to a LED trigger called 'heartbeat'.  I don't think it really means any ...

When I put my Orange Pi One and Orange Pi PC under heavy load the LED does pulse more quickly.  It seems to be heat-related since the fast LED doesn't stop after I halt the load test.

Is it a kernel function?  I don't see any processes in userspace that seem to be monitoring load.

The_Loko

aegrotatio replied at 2016-5-14 10:57
When I put my Orange Pi One and Orange Pi PC under heavy load the LED does pulse more quickly.  It ...

It's kernel controlled, I think the pulse speed depends on the actual cpu frequency, so higher load = higher freq = faster blink.

didacgil9

I think so as well. It may blink every 5M processor instructions, and depending on the CPU frequency, which is based on the CPU load, those instructions may go faster or slower to be executed.

aegrotatio

When I turn off the Orange Pi and restart it with zero load it still beats at the very fast rate.  I think it's heat.

Penholder

FrankJScott replied at 2022-3-1 22:06
In reply to the guy inquiring about how to start a dog massage business, equine massage business nam ...

BOWMASTERS MOD APK is an addictive and interesting game. In this game you shall fight against your enemies in the battle. This is a shooting game. You have to choose characters which will help you in the battle. This game has many levels and stages. Each character has different skills and different weapons.In this game you will participate in the epic fight. Challenge your enemies and shoot them with weapons.

https://apkmodule.com/bowmasters-mod-apk/

ogwhatsapp

I download all the apps I use for my convenience. And this whatsapp is no exception. If you want to try to download, I advise you right here
fm whatsapp old. I am sure that you will like it and you will use it every day. Don't miss such opportunities.

Jagger

I was very impressed by this post, this site has always been pleasant news Thank you very much for such an interesting post, and I meet them more often then I visited this site Taxi and Cab services in Jodhpur

fnaf12

Do you like to play video games? After a long day at work, you may have a fun race with your friends or family thanks to the fall guys 3 challenge. Because of its attractive graphics and fascinating gameplay, this game will appeal to everyone.