Pretty sure that this is a farly common issue with the DXGI code. No fix planned for this particular issue so far, but I'll leave this open nonetheless.
Fixed in dd3f4c89ac31aa983c1297ab23da1f6cb12ea82b.
Fixed in dd3f4c8.
I don't believe this is fixed unfortunately, the gamma slider does not work with Proton 5.0-4
Possible regression, it works with 3.16-9
@Evernow newer Proton versions use Wine's dgi.dll, but this fix was made in DXVK's dxgi.dll. Try using DXVK's dxgi.dll by specifying WINEDLLOVERRIDES=dxgi=n %command% in the game's launch options.
@jp7677 Just saw this, yep that fixed it thanks
proton 5.0-4x1 2020-03WINEDLLOVERRIDES=dxgi=nx1 2020-03WINEDLLOVERRIDES=dxgi=n %command%x1 2020-03
Software information
Witcher 3, GOG version, 1.31, high settings
System information
The game works pretty much perfectly apart from this little detail: the Gamma slider has no effect whatsoever in the options.