What does an idle CPU do?

In the last post I said the fundamental axiom of OS behavior is that at any given time, exactly one and only one task is active on a CPU. But if there’s absolutely nothing to do, then what? It turns

cpu - What is Maximum Frequency, why is it above 100% most of the time, and why is it so high when it should basically be idle? - Super User

Idle CPU usage of k3s is high and continuously increases over time

Extreme load peaks measured for AMDs Ryzen 7000 CPUs - also in idle!

Your idle computer can help find a cure for Covid-19 –

What does a CPU do when it's doing nothing?

Idle GPU Temperature: Impact on Power Consumption and Efficiency - ElectronicsHub

Solved Recall that the percentage of CPU idle time is given

High Cpu Usage While Idle - indesign 2021-2022-202 - Adobe Community - 14157489

GNS3 Labs, CCNP, CCNA Labs: IDLE PC GNS3

Idle CPU Usage on Grafana seems extremely high: 70,000%+ - metrics - Fly.io

What is the System Idle Process and Why Is It Using Most of the CPU?

Intel has a solution for high idle power on Intel Arc desktop GPUs

What Is The Optimal CPU Idle Temp? Find Out Now!

Why is the System Idle process using 80% of my CPU all the time?