High kworker CPU usage on idle linux system

I&rsquo;m running an HP Z230 SFF as my little homeserver for the last 5 years. It is not the most powerful, but it was energy-efficient enough, and was doing great for the things I&rsquo;m running on it, so I kept using it. Recently I noticed that despite being idle, the power usage was higher than normal. Normally the power usage with idle workload oscillates around 25-30W, but it was at nearly…