https://bugs.winehq.org/show_bug.cgi?id=45989
--- Comment #4 from Alex Xu alex_y_xu@yahoo.ca --- I set the environment variable but it appeared to have no visible effect. I also applied Dave Airlie's patch and didn't set the variable and it also had no visible effect.
Also, I didn't mention it, but if you look closely, you can see narrow horizontal dark bars on the screen. The opacity of the bars varies based on camera direction from transparent to apparently completely black. Also, the edges of the bars aren't solid, they're kinda pokey (vaguely similar to a zoomed out audio waveform) and move related to the texture displayed in that area (e.g. if Geralt is under the bar, they kinda jiggle, but on a non-moving background like the wall they don't move).