dri falling back to software in 4.8-stable

[lreid at okstate.edu]

I've been noticing that GL performance has been really awful on my system lately, so I did some digging around. Here's a glxinfo:

name of display: :0.0
libGL error: 
Radeon DRI driver expected DRM driver version 1.3.x or newer but got version 1.1.1
libGL error: InitDriver failed
display: :0  screen: 0
direct rendering: No
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
client glx vendor string: SGI
client glx version string: 1.2
client glx extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
GLX extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
OpenGL vendor string: Mesa project: www.mesa3d.org
OpenGL renderer string: Mesa GLX Indirect
OpenGL version string: 1.3 Mesa 4.0.4
OpenGL extensions:
    GL_ARB_imaging, GL_ARB_multitexture, GL_ARB_texture_border_clamp, 
    GL_ARB_texture_cube_map, GL_ARB_texture_env_add, 
    GL_ARB_texture_env_combine, GL_ARB_texture_env_dot3, 
    GL_ARB_transpose_matrix, GL_EXT_abgr, GL_EXT_blend_color, 
    GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_texture_env_add, 
    GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, 
    GL_EXT_texture_lod_bias
glu version: 1.3
glu extensions:
    GLU_EXT_nurbs_tessellator, GLU_EXT_object_space_tess

Now, the drm driver works correctly, and the radeon drier is loading fine. After turning on verbose debugging output in the libGL library, I get this:

libGL error: 
Radeon DRI driver expected DRM driver version 1.3.x or newer but got version 1.1.1
libGL error: InitDriver failed

Any ideas?