[Bug 101596] Blender renders black UI elements

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=101596

            Bug ID: 101596
           Summary: Blender renders black UI elements
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: darkdefende@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 132251
  --> https://bugs.freedesktop.org/attachment.cgi?id=132251&action=edit
glxinfo output

It seems like a recent change to llvm or mesa broke blender on radeonsi. It
works fine with llvm 4 and mesa 17.1.3.

Steps to reproduce:

1. Open the blender default cube scene.

2. Open the "N" panel by pressing N while your mouse cursor is in the 3d view.

3. Scroll down to the "Shading" tab and check "Matcap"

4. Now UI elements becomes black (and more and more will become black as you
use the program)

See the attached screenshots

I should also point out that it is not only matcaps that triggers this.
However, it is the fastest way to trigger this.

I have attached the output of glxinfo.

BTW, there is also a other long standing problem where you have to use tripple
buffering in blender with radeonsi or the UI is messed up. I didn't find any
bug for this either, but it has been a problem for a long time so I don't know
if this is known?

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