10-21-2019 08:05 AM - edited 10-21-2019 08:11 AM
I recently bought a Thinkpad L490. It works fine - in general - but the fan behavior is quite strange: If you run a stress test (e.g. Prime95) the fan stays off most of the time. It turns on occasionally, only to turn off again after a few minutes (with the stress test still running). That means that the CPU is throttled most of the time :/
Latest BIOS and all Lenovo drivers are installed.
I tried to manually control the fan using TPFanControl. Manually setting the fan to one of the higher fan levels (>= 4) works fine (although they are quite noisy).
However, the fan stays off when trying to set a low fan level from 0-3. It makes a short noise and the displayed RPM go up for a moment, but it does not actually even start running on those levels.
Is this normal for the Thinkpad L490? Or could this be a hardware problem of my device?