jeloneal got a reaction from Green Daddy in K-worker problem on A20 based boards
I can confirm what @sgei is reporting but on my cubietruck with the latest armbian buster release. See my screenshot:
top shows some kworker thread "events_freezable_power_" every few seconds with 10% load. Seems to be related somehow. At least this leads to the CPU being almost continually clocking @960MHz.