https://bugs.freedesktop.org/show_bug.cgi?id=75794
Priority: medium Bug ID: 75794 Assignee: dri-devel@lists.freedesktop.org Summary: Accumulation of black squares with OpenGL applications at high resolutions Severity: normal Classification: Unclassified OS: Linux (All) Reporter: l.mollari@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.