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The switch works perfectly, but the problem is that Open GL acceleration doesn't seem to work on the external screen (TV) anymore, though I'm certain that it did work before.
I remember that at some point there used to be an additional command I needed to run (xrender something something perhaps...? I'm not sure about the name of the binary, though) in addition to the two above to get the acceleration working on the external screen. Then at some point the command binary disappeared, but the acceleration seemed to work fine without it. Now it has ceased to work (likely due to some X upgrade), so what do I need to do the get it working again?
Note that Open GL works just fine on the internal screen of the laptop.
I'm seeing incredibly slooooow graphics in all OpenGL apps. For example: I like to use Photopile (which uses OpenGL) to show my photos on the television screen when the machine is connected to it. The screen update of photopile is much much slower on the external screen compared to the laptop's internal screen.