RE: [XPS 9360 DE] Kernel 4.9 fixed my suspend problems
May I ak you how you updated the Bios ?
Sure. Whereas in the old days one would have to boot from some DOS boot stick and run the .exe from there, it is now possible to do this from the BIOS directly (not sure which version of what introduced this, but I saw it on this forum somewhere).
You have to first download the update .exe (find it via Dell Support pages, or simply click this link for the current 1.2.3 version) and copy it into the boot partition:
sudo cp ~/Downloads/XPS_9360_1.2.3.exe /boot/efi/
Now enter the BIOS menu (press Esc and F12 during Dell logo during boot) and select update BIOS from there. You should be able to see the exe file there directly. Follow instructions from there.
Disclaimer: This may break your computer if you don't know what you're doing or if you don't do it right.