[Bug 107454] BLENDER 2.8 principled BSDF shader and shadow are broken in EEVEE on mesa gallium r600g gpu

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107454

            Bug ID: 107454
           Summary: BLENDER 2.8 principled BSDF shader and shadow are
                    broken in EEVEE on mesa gallium r600g gpu
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: amonpaike at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

on the new blender 2.8 under development some shaders and projections of
shadows are broken .. I do not know how to describe the problem technically, I
have already reported the problem to the bug list of blender developers,
although I know that the problem is probably the mesa drivers, because on my
laptop that has two gpu, with the intel gpu the graphics is perfect, with the
gpu amd I have these problems of shading.
For a specific description of the problem, refer to this bug report
https://developer.blender.org/T56211
(the tests were done on the latest mesa drivers built daily by padoka ppa, with
the stable drivers of ubuntu 18.04 eevee shading was totally unusable, so the
situation has improved significantly)

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