gothic 2

Install "workshop" branch of the game
Install mods from workshop: union, ninja, dx11 renderer (updated version at https://v1.steam.hlxgame.cc/sharedfiles/filedetails/?id=2787015529) , zgamepad, fps improver and (optionally) "gothic II: classic" if you want to disable NoTR content (I did - I wanted to play G2 the way I played it 20 years ago. You may install other mods, but check compitability before doing so.
Fix sound based on @Pulsar commend (protontrics + file edits)
Fix UI scaling based on @Senpai Rupcio suggestion - find your gothic installation folder, find System/Systempack.ini and search for scale parameter. I set it to 1.2
In graphics settings, I set it from Ultra to High + locked FPS (using SteamDeck overlay) to 45

proton 8.0-5

poe 2

proton 10.0-3

witcher 3

PROTON_USE_WINED3D=1 %command%

then go to settings and turn on dx 11

proton 10.3

https://www.reddit.com/r/linux_gaming/comments/18a3w1y/dragon_age_origins_ultimate_steam_version_does/?chainedPosts=t3_ipel2i <- Linux

https://v1.steam.hlxgame.cc/app/47810/discussions/0/4843149226482371675/

https://www.nexusmods.com/dragonage/mods/5989

(4gb ram restriction laa)

Baldursgate 3

proton experimental

No idea why people are recommending a --vulkan flag, it doesn't do anything.

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Easiest way to get Vulkan working is:

Launch the game without the --skip-launcher flag.
Pick Vulkan in the launcher and boot the game up.
Close the game.
Re-add --skip-launcher to launch options.

Now you're booting the game in Vulkan mode.

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Final launch options: gamemoderun mangohud %command% --skip-launcher

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mangohud is optional. If you do use mangohud, you should see "VULKAN" below the CPU utilization.