[Bug 102885] regression - 17.2 sparkle grid in shadows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102885

            Bug ID: 102885
           Summary: regression - 17.2 sparkle grid in shadows
           Product: Mesa
           Version: 17.2
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: darktjm at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 134348
  --> https://bugs.freedesktop.org/attachment.cgi?id=134348&action=edit
Ugly shaded areas

See attached image.  While I was retesting many games in wine, I noticed that
multiple games, when run in wine, show black background with dot grids instead
of alpha blending, apparently.  Reverting to 17.1.x fixed this.  I haven't the
patience or continuous power to my machine to git-bisect; the only thing I can
help with is that it doesn't do this with LIBGL_ALWAYS_SOFTWARE=1, so it's
likely a radeonsi bug rather than mesa core.

Hardware:
    Device: AMD Radeon R7 Graphics (AMD CARRIZO / DRM 3.18.0 / 4.13.2-gentoo,
LLVM 5.0.0) (0x9874)
OpenGL renderer string: AMD Radeon R7 Graphics (AMD CARRIZO / DRM 3.18.0 /
4.13.2-gentoo, LLVM 5.0.0)

Note that this has been broken since the earliest rc I tried, also with earlier
releases of the kernel and llvm, firmware from both before and after 06 Sept.

Apologies if this has already been reported; I can't really tell and it has
been broken now for at least all rcs I've tried, 17.2 release, and 17.2.1.

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