Hi, I recently purchased a Dell XPS 13 (9350, broadcom chip). After installing Fedora 23 (wiped out Windows), it mostly works, except for the touchscreen. Among its problems, it stops working after suspend & resume. After some searching in forums, etc. I issued "modprobe -r hid_multitouch && modprobe hid_multitouch". This enabled the touchscreen, but the computer had a surprise in store for me: both my touchpad and my touchscreen are controlled by hid_multitouch! I had to do "xinput list", then "xinput enable <id>" to get my touchpad working again after said command.
Also, looking at /var/log/Xorg.0.log, I see that the touchscreen is reinstalled using the "evdev" driver, not "hid_multitouch". Any ideas on how to fix this?