My laptop's (Lenovo Legion Y520) fan starts running fast after 5-10 mins of inactivity out of nowhere. When I open up Task Manager, the CPU utilization seems around 25-30% and then drops to ~6% in 2-3 seconds, which is followed by the fan running slower in another 2-3 seconds. It seems like my computer is being used for a program while I am away from keyboard and I cannot detect it. Are there any solutions for that? I tried everything I can find in the internet. Thanks.
When I open up Task Manager, the CPU utilization seems around 25-30% and then drops to ~6% in 2-3 seconds
That is normal for Windows 10 and, by itself, does not present much of a CPU load.
My fan comes on for a steady 35% plus CPU load and that, too, is normal.
Open Task Manager, let it settle for 10 seconds and then see what processes are taking a lot of CPU.
For normal browsing conditions, CPU should run <5% more than 90% of the time.
I think you will find something is running that you did not anticipate or do not know about (virus) .
I had exactly same problem few years ago. Unfortunately, I cannot accurately remember what exactly solved it. I will list a few things I remember , try them.
- Disable programs in TaskManager/ Startup.
- Changing hardware acceleration for Chrome.
- Decreased paging file size.
- Keeping Task Manager open all the time so that I can locate problematic processes.
- Suppressed some windows process that indexes files for better searchability. (this might be different now that Cortana is there)
- There are also programs to monitor CPU temperature.