HD Radeon 5700 (GPU accel disabled or not working)

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https://bbs.archlinux.org – I've install everything needed by acceleration, but still not working.some xorg.log.0 said : [  3033.502] (II) RADEON(0): GPU accel disabled or not working, using shadowfb for KMSfull logglxinfo :client glx vendor string: Mesa Project and SGI client glx version string: 1.4 OpenGL vendor string: VMware, Inc. OpenGL renderer string: Gallium 0.4 on llvmpipe OpenGL version string: 2.1 Mesa 7.11.2 OpenGL shading language version string: 1.20dmesg | grep drm[ 0.896749] [drm] Initialized drm 1.1.0 20060810 [ 0.896835] [drm] radeon defaulting to kernel modesetting. [ 0.896890] [drm] (HowTos)