It does not make the problem go away for me: it does improve it though: instead of no screen redraws at all, the screen redraws about once every 3 seconds instead. As with vsync enabled, glxgears constantly claims that is it doing 4000 FPS. So I don't think this really fixes the problem at all, it just removes some, but not all, of the xsync calls causing the problem.
It does not make the problem go away for me: it does improve it though: instead of no screen redraws at all, the screen redraws about once every 3 seconds instead. As with vsync enabled, glxgears constantly claims that is it doing 4000 FPS. So I don't think this really fixes the problem at all, it just removes some, but not all, of the xsync calls causing the problem.