Buffer swapping was broken in commit cac7c8dc4b154d37ff27430aa7b714ac84f3d092. When rendering 3D graphics, old buffer contents show up between all rendered frames. This happens in both fullscreen and windowed mode. The problem is visible on Haswell and Broadwell but not on Skylake, with both DRI2 and DRI3. It can be easily seen when running a GPU intensive program like FurMark.
Spotted something that should be relevant: commit 4556ac396ed46a476cc970946011e377451346ff Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Mon Jul 4 10:07:51 2016 +0100 sna: Track TearFree shadow as an active scanout If it is along these lines, we should be trigger an assert when compiled with --enable-debug.
The issue was fixed in the latest commits. This commit: commit bc369bbf4aed9df3c802bf8759bbdcdd1232f893 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Jun 28 12:26:55 2016 +0100 sna: Avoid recursion by testing shadow.wait fixed fullscreen buffer swapping on Broadwell, and this commit: commit 26f8ab5429a554801641415f0ab3b2d68cea1d00 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Mon Jul 4 10:11:50 2016 +0100 sna: Restore local damage processing for TearFree/DRI2/swcursor early fixed the issue in windowed mode. Both platforms work correctly now, so I'll change the bug status to fixed.
bc369bbf4aed9df3c802bf8759bbdcdd1232f893 actually causes regression for me like that: https://www.youtube.com/watch?v=OceCdwR5sB8 Reverting this commit makes problem go away.
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