I believe hardware acceleration is working:casey@Utopia:~$ glxgears
libGL error: Version 7 or imageFromFds image extension not found
libGL error: failed to load driver: r600
Running glxgears seems to give good values:casey@Utopia:~$ glxinfo | grep OpenGL
libGL error: Version 7 or imageFromFds image extension not found
libGL error: failed to load driver: r600
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD BARTS (DRM 2.48.0)
OpenGL core profile version string: 3.2 (Core Profile) Mesa 11.2.0
OpenGL core profile shading language version string: 1.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 11.2.0
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 11.2.0
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:
Any idea what the "libGL error / failed to load r600" messages are about?casey@Utopia:~$ vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
libGL error: Version 7 or imageFromFds image extension not found
libGL error: failed to load driver: r600
ATTENTION: default value of option vblank_mode overridden by environment.
7133 frames in 5.0 seconds = 1426.516 FPS
7097 frames in 5.0 seconds = 1419.041 FPS
7247 frames in 5.0 seconds = 1449.393 FPS
7412 frames in 5.0 seconds = 1482.110 FPS
7343 frames in 5.0 seconds = 1468.531 FPS
7359 frames in 5.0 seconds = 1471.635 FPS
7190 frames in 5.0 seconds = 1437.919 FPS
7338 frames in 5.0 seconds = 1467.579 FPS
Radeon HD 6870 on Ubuntu-Mate 16.04 with kernel 4.10-rc4