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Dell XPS 15 9570 fans often on and fast


I have a Dell XPS 15 9570 with an Intel Core i7-8750H and an NVIDIA GeForce GTX 1050 Ti. I have BIOS 1.10.1 and all drivers up to date. Moreover I have a dual boot between Windows 10 and Ubuntu 19.04. In Ubuntu I have the fans always on at 2500 RPM with a strange behavior. Meanwhile the system is idle the temperature on GPU increases from 40°C to 45°C in a few seconds. Then the system increases the fans speed to 3200/3800 RPM and the GPU temperature decrease to 40°C like before and the fans come back to 2500 RPM. But again, the temperature raise again and again the fans speed fast. If I want peace for my ears I have to switch the PRIME profiles onto NVIDIA X server settings to Intel (Power Saving Mode), but I have to give up the use of nvidia graphics cards. I attach the charts that shows this strange behaviour. On Windows 10 if the GPU workload is around 30%/50% and th temperature is around 50°C the fans runs fast and loud. I wonder why I have this strange behaviour. This has happened since my motherboard, my heat sink and my fans was changed. Thank you

Schermata del 2019-05-27 17-08-30.png

In blue the GPU temperature and in red the fans speed.

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