[Bug 75794] New: Accumulation of black squares with OpenGL applications at high resolutions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75794

          Priority: medium
            Bug ID: 75794
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Accumulation of black squares with OpenGL applications
                    at high resolutions
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: l.mollari at gmx.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 9.1
         Component: Drivers/Gallium/r300
           Product: Mesa

Created attachment 95154
  --> https://bugs.freedesktop.org/attachment.cgi?id=95154&action=edit
glxgears with artifacts

I am having trouble with black areas made up by 8 × 8 pixel squares that occur
in 3D enabled applications when using the build-in TFTs native resolution of
1920 × 1200. Lower resolutions are not affected (see attached screenshots [1]
and [2]). The shape of these areas is sensitive to the actual content drawn in
such a way that it acts like a shadow or an impression of the actual 3D
geometry and even of 2D HUDs in 3D enabled games. These artifacts are
persistent across different applications i. e. the current application inherits
the artifacts from the previous one and vice versa [4]. I have uploaded a video
showing the artifacts described in 0 A. D.:

    https://www.youtube.com/watch?v=Rpu-s8DowFw

I narrowed the glitches down to Mesa 3D version 9.1 that seemingly introduced
the bug. The bug seems to be still present in the most recent Mesa 3D and Linux
kernel versions [6].

Damaged hardware is unlikely to be the cause for these glitches since I was
able to reproduce the same artifacts on three different laptops of the same
product line, all equipped with the same GPU.

All tests were performed with unaltered default settings of the respective
distributions. No manually touched or customized xorg.conf files or kernel mode
settings were in place.

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