AMD GPUs are trash, you need non-free firmware to run them. And this firmware is removed from Trisquel and libre kernels. If you want a nice compatibility you need to use built-in Intel's GPU, most of them work, but not the latest, Skylake, which need non-free software. With Nvidia you will get a nice compatibility, it works with free software, and, if you need the best performance, forget Intel, and buy some mid/high end nVidia Kepler and reclock it with 4.4 libre-linux. (gtx650,gtx770..,...,...).

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