https://bugs.freedesktop.org/show_bug.cgi?id=101969

            Bug ID: 101969
           Summary: Massive graphics corruption with World of Warcraft
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: rankincj@googlemail.com
        QA Contact: dri-devel@lists.freedesktop.org

World of Warcraft's login screen has become jumbled garbage with the latest
Mesa from git. I don't recognise anything as being rendered by WoW, although
there are elements from other applications and windows dancing all over the
place.

I have performed a git bisect, and have identified this commit as the cause:

commit 064550238ef0b44e341b2a50c3147f83c2a6d5b0
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Thu Jul 27 02:40:34 2017 +0200

    radeonsi: use CLEAR_STATE to initialize some registers

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

:040000 040000 621668e602ccd2f36299e329b096586baa920ba0
68d43945fde8fbbfad6ae444546a981af2507b03 M      src

Mesa describes my setup as:

Extended renderer info (GLX_MESA_query_renderer):
    Vendor: X.Org (0x1002)
    Device: AMD BONAIRE (DRM 2.50.0 / 4.12.4, LLVM 5.0.0) (0x665f)
    Version: 17.3.0
    Accelerated: yes
    Video memory: 2048MB
    Unified memory: no

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