(In reply to Ernst Sjöstrand from comment #9) > 1) mouse freezes when starting steam This is probably fixed in xserver 1.17.3 by http://cgit.freedesktop.org/xorg/xserver/commit/?h=server-1.17-branch&id=8415eca0abc00ec96cb94cd656b58edbfa8f09a3 > 2) if I run Unigine Heaven benchmark, apart from low performance (~30 fps @ > 1080p), vsync seems to break down really bad during the run, and stays > severely broken afterwards. What does "vsync breaks down" mean exactly?