Everything looking like GL, drm, dri in /usr/local deleted:

LIBGL_DEBUG=verbose glxinfo | grep ' render'
libGL: pci id for fd 4: 1002:699f, driver radeonsi
libGL: OpenDriver: trying /usr/lib/x86_64-linux-gnu/dri/tls/radeonsi_dri.so
libGL: OpenDriver: trying /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
/usr/local/share/libdrm/amdgpu.ids version: 1.0.0
libGL: Using DRI3 for screen 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
OpenGL renderer string: Radeon RX 550 Series (POLARIS12 / DRM 3.19.0 /
4.14.0-041400-generic, LLVM 3.9.1)

I'll have a look for kernel 4.13 in a minute.