Thank you for this information! I updated the BIOS to the latest available and the problems seems to have gone away. The new versions of the firmware is 1.20 from 9/9/2020 [1], the previous one was named 1.5. I do not think I had ever upgraded the BIOS before, as this laptop came with ubuntu out of the box and I immediately put Opensuse, there is no Dell upgrade manager. thank you again for your help [1] https://www.dell.com/support/home/fr-fr/drivers/driversdetails?driverid=6pv6v&oscode=wt64a&productcode=precision-15-5520-laptop