Two years since tuxDB.com launched! Thanks all for the support!
With latest Wine and DXVK, Ubisoft's STEEP launches and runs, although not great and in offline mode only. I guess the online-drm isn't working so it fallbacks to offline. At least I can play free-roam, which I enjoy! It also only runs in windowed mode. Borderless or fullscreen shows black screen. Maximized window works.
CPU: Intel i7 6700k
GPU: Nvidia 980 Ti
Nvidia driver version: 415.25
Wine version: tkg-3.21
DXVK version: 0.94
Distro: Arch Linux
Recorded and encoded externally with AVerMedia Live Gamer Portable 2 Plus and ffmpeg
Buy: https://steep.ubisoft.com/ or on Steam
Install using Lutris (Uplay only right now): https://lutris.net/games/steep/
Watch my earlier Steep video, unlisted: https://www.youtube.com/watch?v=AbJD4izCt4c
Nice. Got it also working in Steams Proton 3.16-6 with an older uplay-version installed manualy and WindowMode=0 in STEEP.ini, but i first had to finish the tutorial under a windows installation, else it didnt let me play the free roam mode