[Bug 109382] RX Vega M GL performance and stuttering issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109382

            Bug ID: 109382
           Summary: RX Vega M GL performance and stuttering issues
           Product: Mesa
           Version: 18.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: princetonf at optonline.net
        QA Contact: dri-devel at lists.freedesktop.org

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.

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