At the moment i think my laptop light is making me feel really really uneasy. I realized, that it could be PWM. I found this site, it is in german. It shows PWM frequencies of various laptops, mine is 312, which is too low. 🙁
Perhaps it helps some of you to sort out the some of the bad apples . 😉
https://www.notebookcheck.com/PWM-Ranking-Welche-Notebooks-Smartphones-und-Tablets-nutzen-PWM.163974.0.html