My cm14.1 port isn't finished. Who wonders, video recording doesn't work. I also tried to backport bluetooth driver to enable bluez5, but this doesn't work correctly either. It tatkes ages too find other bluetooth devices and it doesn't pair. Have also included the anbox binder stuff in the kernel, but first i'd like to fix the rest. But with other devices i meant officialy supported ones from Jolla. Rearding your S7 port, like i told you on irc, i would build some problematic packages with a lower revision. Maybe it was something added that the S7 doesn't like since driim build his version. He released his build at the beginning of 2018, so i would ignore all commits to qt5-qpa-hwcomposer since the beginning of 2018 and test that.