I have a Lenovo Thinkpad X240, and it works well and on normal temperatures. However, sometimes the fan does not start even when running high stress processes that warm up the CPU drastically. In these situations when I put the device to sleep and start it up again, everything goes back to normal, the fan starts and cools the CPU down quickly. How to investigate this problem? Can this be a hardware issue?
I am running Arch Linux and I have