Created attachment 115419 [details] Wall with light effect triggering the artifact. On game Shawdow Warrior, with Southern Island chip, drivers from this PPA: https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers Experienced both on Ubuntu 14.10 and, after upgrade, on Ubuntu 15.04. Some special effects trigger a visible artifact on triangle primitive boundaries, probably, see screenshot attached. With fglrx, the issue is not present. It seems the problem is on some post-processing shader, because, as can be seen in the screenshot, the visible triangles does not respect the boundary of scene objects, and if I move the mouse, they are fixed relative to the screen. Running with the following env var (otherwise the game is unplayable slow on current video settings): R600_DEBUG=sb Relevant info from glxinfo: OpenGL vendor string: X.Org OpenGL renderer string: Gallium 0.4 on AMD TAHITI OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.6.0-devel (git-7f5a8ac 2015-04-25 utopic-oibaf-ppa) OpenGL core profile shading language version string: 3.30 OpenGL core profile context flags: (none)
(In reply to Lucas from comment #0) > Some special effects trigger a visible artifact on triangle primitive > boundaries, probably, see screenshot attached. Looks like bug 88642, which is fixed in current LLVM. > Running with the following env var (otherwise the game is unplayable slow on > current video settings): > R600_DEBUG=sb That environment variable has no effect with the radeonsi driver.
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