[Bug 103808] [radeonsi, bisected] World of Warcraft scribbling all over screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103808

            Bug ID: 103808
           Summary: [radeonsi, bisected] World of Warcraft scribbling all
                    over screen
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: rankincj at googlemail.com
        QA Contact: dri-devel at lists.freedesktop.org

OpenGL renderer string: AMD BONAIRE (DRM 2.50.0 / 4.13.13, LLVM 6.0.0)
OpenGL core profile version string: 3.3 Mesa 17.4.0-devel (git-4b0dc098b2)

Now that Fedora has upgraded to libdrm-2.4.88, I have discovered that World of
Warcraft now has huge screen corruption with Mesa-git. A git bisect has
identified this commit as the culprit:

4b0dc098b2561c07c59f7dab2813640a25789bf1 is the first bad commit
commit 4b0dc098b2561c07c59f7dab2813640a25789bf1
Author: Marek Olšák <marek.olsak at amd.com>
Date:   Thu Nov 2 00:00:53 2017 +0100

    gallium/u_threaded: don't map big VRAM buffers for the first upload
directly

    This improves Paraview "many spheres" performance 4x along with the
radeonsi
    commit.

    Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>

:040000 040000 7b3cd35a0bc5923f724cfb9d936f7a88ea808c8a
300c7a5176280a410796121ac66c04a3b39b9bc9 M      src

WoW continues to run, but UI elements in particular disappear and are replaced
with scribbles across the screen, which itself flickers and flashes.

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