Sounds exciting about Watch Dogs, and I've just got Witcher 3 running perfectly, somehow, lol ... am not tech and therefore very glad of POL and your guides, but have got lucky, with a little bit of reading and just trying out something, on top of what is already installed in main system.
ALREADY INSTALLED
============
4.17.0-0.bpo.1-amd64 x86_64
KDE Plasma 5.12.6 Distro: Neptune 5.0 (refresh)
LENOVO Erazer X310 i7-4790
AMD Cape Verde PRX [Radeon R9 255 OEM] driver
Display: x11 server: X.Org 1.19.2 driver: ati,radeon
v: 4.5 Mesa 18.1.6 direct render: Yes
Audio:
Card-1: Intel 8 Series/C220 Series High Definition Audio driver: snd_hda_intel
v: kernel bus ID: 00:1b.0
Card-2: AMD Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series]
driver: snd_hda_intel v: kernel bus ID: 01:00.1
mesa-vulkan-drivers, libvulkan1 and libvulkan1(i386) already installed in Neptune.
vulkaninfo (via vulkan-utils) shows Vulkan Instance Version: 1.1.70
Playonlinux 4.12
latest wine staging ...
sudo dpkg --add-architecture i386
wget -nc
https://dl.winehq.org/wine-builds/Release.key
sudo apt-key add Release.key
For Debian Stretch:
deb
https://dl.winehq.org/wine-builds/debian/ stretch main
(ADD THIS TO root/etc/apt/sources.list)
sudo apt-get update
sudo apt-get install winehq-staging
winetricks vcrun6sp6 (already installed for art program ... don't know if this helped about Witcher3)
INSTALL
=====
GOG Witcher 3: Wild Hunt GOTY
win8.1
64bit
dx9/10/11
all vcredists bar 2005 (find this hangs occasionally)
dxvk 0.7; 5 32bit files into syswow64, 5 64bit files into system32.
searched about dxvk settings and found lutris info:
https://lutris.net/games/install/5770/view ...
configure wine/libraries ... xaudio2_7: native,builtin (in top dropdown menu) and just chose highest option in lower dropdown menu: d3dx11_43 (native, builtin)
read that setting any other ambient occlusion than None will freeze the game. turned this off incase, before began game proper.
Thanks to your tutorials, I knew to try the various dx and redists, and understood how to apply dxvk. Lucky to find the lutris dxvk info, and that so much was already installed within Neptune, plus hardware certainly likes Witcher3. Happy playing!