I experienced a strange behavior from games "Pathfinder - Kingmaker" and "Pillars of eternity II" when I run them using mesa 19.1.4 or later (the last version I tried is 19.2.0-rc3). With mesa 19.1.3, both games worked perfectly.

In both games, the problem happens right after saving. In Pathfinder, the main part of the game screen, where the map is, starts becoming darker and darker until it becomes completely black; in Pillars of Eternity, instead, the image of the save dialog persists on the screen, covering the game itself (I say "the image of the dialog" because you can't interact with it). In both games, everything remains perfectly functioning: you can click (blindly, of course) on a point on the map and the characters will move there; you can move the mouse and the cursor will change its shape correctly depending on what's beneath it and so on.

In Pillars of Eternity, this bug only occurs if you save using the "Save" dialog, and not with a quicksave using the keyboard shortcut; in Pathfinder, instead, it happens in both cases.

I'm using Gentoo with kernel 5.3.0; my video card is a Radeon 580X.