** Description changed:
+ [ Impact ]
+
I'm having a strange issue with the game Path of Exile (free). With Ubuntu
Wayland session, vsync on, I get very irregular frame rates, it jumps around 40
fps.
If I switch to Plasma Wayland the game is very smooth 60 fps.
I'm running the game from Steam with Proton. I've tried Proton Experimental
and Proton 8.0 so far, no difference.
The game uses Vulkan so I guess it's being allowed to set up all the swap and
presentation stuff pretty much itself... ?
MUTTER_DEBUG_DISABLE_TRIPLE_BUFFERING=1 doesn't help Mutter so it's not
strictly related to triple buffering, which makes sense since it's a
full screen game anyway.
+ [ Test Plan ]
+
+ None known, other than the OP to run the game.
+
+ [ Where problems could occur ]
+
+ In rendering performance of fullscreen apps/games.
+
+ [ Workaround ]
+
+ Add this to /etc/environment:
+ CLUTTER_PAINT=disable-dynamic-max-render-time
+
+ [ Other Info ]
+
Kernel: 6.2.0-1003-lowlatency
GPU: Radeon 6800 XT
CPU: Ryzen 9 5900X
** Changed in: mutter (Ubuntu Mantic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2016990
Title:
Irregular frame rate in some fullscreen games
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