title: Disable vertical sync for glxgears
body: <p>Sometimes you need to check whether you Linux 3D acceleration is really working (besides the <code>glxinfo</code> output). This can be quickly done by the <code>glxgears</code> tool. However, the FPS are often limited to the displays vertical refresh rate (i.e. 60 fps). So the tool becomes more or less useless since even a software render can produce 60FPS glxgears easily on modern CPUs. </p>
  
  <p>I found it rather hard to get a quick and easy solution for this, I answer my own question. Hopefully it saves your time.</p>