TL;DR: two Dell XPS 13 (9360) with Intel Dual Band-Wireless-AC 8265 have weak wifi signal.
I have two Dell XPS 13 (9360) running Ubuntu Mate 17.10 and Ubuntu Mate 16.04. I recently replaced the original wifi card from Killer with the mentioned wifi card as I read that this could solve a lot of the encountered wifi problems I had. In fact it speeded up the connection process to a network, but still the signal is quite weak when compared to Microsoft Windows.
I already turned off the power management and verified the region code, which was correct. I also read a lot about similar issues on the internet, but apparently people barely have problems with the wifi strength.
At home I have to be within a distance of 1 meter to the routher so that the icon shows 4 bars. If the distance is greater, it will already reduce to 3 bars. While at home this isn't such a huge problem, at university I'm always losing connection to the network (eduroam) after an undefined amount of time. Unfortunately, I, a student, just can't tell the sysadmins that they should put an AP close to my lecture room because Linux drivers don't work as they should. Reconnecting by clicking the network in the context menu of the notification icon works most of the time, but sometimes only a reboot helps to reconnect again.
Both laptops don't run Windows anymore.
A bit off-topic but I would love to pay someone to write a good working driver, is there a way to sponsor driver development for linux for a specific device?