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I am really confused about the state of AMD drivers on 16.04

My question is six-fold.

  1. What is the difference between
    • The amdgpu driver,
    • The radeon driver, and
    • The amdgpu-pro driver?

  1. When would each of those drivers be used?

  2. Are they all open-source?

  3. Can you switch between them?

  4. Which GPUs are supported?

  5. Is AMD working on an fglrx replacement for 16.04?

As I do not have an AMD card, I am unable to experiment.

I understand this is a broad question, but I want this to be a canonical question :)

You'reAGitForNotUsingGit
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    A community wiki answer might be good so that we don't end up with a ton of answers. – You'reAGitForNotUsingGit Jul 07 '16 at 17:08
  • yes open source. 6. no they abandoned fglrx and are focusing on open source. version 15.x.x was the last closed source amd driver featuring the fglrx. -- also, i agree a good wiki that answers it all would be very helpful about this. the information on much of this is scattered everywhere in no particular place.
    • – David Jul 07 '16 at 17:11
  • "I understand this is a broad question, but I want this to be a canonical question :)" Then you need to update the answer, it does not even answer all your questions or include anything about usage or installation of the drivers or what chips they support. If you want to make it a Canonical question, it must include all relevant information. i am voting to close this as too broad, I don't know why it is still open. i suggest you update it a lot before it is reviewed. – Mark Kirby Aug 09 '16 at 12:27
  • @MarkKirby - I know it needs work. And I will get to it eventually... – You'reAGitForNotUsingGit Aug 09 '16 at 22:32