RX Vega M GL performance and stuttering issues

Submitted by pri..@..ne.net

Assigned to Default DRI bug account

Link to original bug (#109382)

Description

OpenGL renderer string: AMD VEGAM (DRM 3.27.0, 4.20.3-arch1-1-ARCH, LLVM 7.0.0) Dell XPS 9575

AMD's discrete GPU on the Kaby Lake architecture performs significantly worse under Linux than under Windows. Below are some rudimentary data I've collected:

Game Linux Windows TF2 30-50 FPS 60-100 FPS Borderlands 2 30-43 FPS 42-52 FPS Minecraft 60+ FPS 40-50 FPS CSGO 40-55 FPS 60+ FPS

Notably, Minecraft is the exception, performing much better under Linux for some reason.

All of the Source engine games (CSGO, TF2) I tested also had a very severe stutter, which would happen every other second.

Version: 18.3