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I have just upgraded from 14.04 to 16.04 and lspci -nn reports:

00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b)
...
09:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360] [1002:6900] (rev ff)

If I run glxinfo instead I get:

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile

How can I enable my R7 GPU and use it? Am I supposed to use the AMDGPU driver? Any suggestion to get decent OpenGL acceleration? I don't want to use the integrated i5...

Thanks for your help!

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Apparently I should prefix any 3d program I want the Topaz XT to be used with DRI_PRIME=1 <command>.

Too bad this locks up the system but that's another problem.

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