Hi Ruopeng,

Thanks. I ran glxgears and see 3 interlocking wheels and this:

Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
22863 frames in 12.1 seconds = 1896.797 FPS
991 frames in 12.3 seconds = 80.354 FPS
961 frames in 12.0 seconds = 80.064 FPS
519 frames in 12.0 seconds = 43.245 FPS
863 frames in 12.0 seconds = 71.934 FPS
899 frames in 12.3 seconds = 72.883 FPS
777 frames in 12.0 seconds = 64.742 FPS
543 frames in 12.0 seconds = 45.257 FPS
780 frames in 12.0 seconds = 65.004 FPS
733 frames in 12.3 seconds = 59.431 FPS
825 frames in 12.0 seconds = 68.746 FPS
519 frames in 12.0 seconds = 43.251 FPS
780 frames in 12.3 seconds = 63.223 FPS
779 frames in 12.0 seconds = 64.935 FPS
779 frames in 12.0 seconds = 64.824 FPS
772 frames in 12.0 seconds = 64.330 FPS
520 frames in 12.3 seconds = 42.156 FPS

Not sure what this means, though? I will look into the graphics card of my local computer.

Thanks,
Ina