Dell XPS 15 (9550) list of hardware and software problems

Hey guys, reading through existing threads I noticed a lot of users are mentioning several problems with their new XPS. To keep track of all issues, and to know which ones are already solved/fixed or how to solve them, I decided to create this thread.

Please leave a comment if you come across new issue or a solution to the existing ones.

Everyone please when reporting a problem/suggestion please mention obligatory:

1. OS version
2. Drives configuration (M.2 only vs M.2 + SSD vs M.2 + HDD...

Dell XPS 15 (9550) list of hardware and software problems