[   185.395] (EE) RADEON(G0): [drm] failed to set drm interface version.
[   185.395] (EE) RADEON(G0): Kernel modesetting setup failed
...
[   185.533] (EE) 
[   185.533] (EE) Backtrace:
[   185.533] (EE) 0: /usr/bin/Xorg (xorg_backtrace+0x3d) [0x57e04d]
[   185.533] (EE) 1: /usr/bin/Xorg (0x400000+0x181da9) [0x581da9]
[   185.533] (EE) 2: /usr/lib/libpthread.so.0 (0x7f5df316a000+0xf880) [0x7f5df3179880]
[   185.533] (EE) 3: /usr/lib/xorg/modules/drivers/fglrx_drv.so (xdl_xs114_atiddxGetGPUMapInfo+0x18f) [0x7f5df01c6ccf]
[   185.533] (EE) 4: /usr/lib/xorg/modules/drivers/fglrx_drv.so (atiddxGetGPUMapInfo+0xd) [0x7f5df0016f6d]
[   185.533] (EE) 5: /usr/lib/xorg/modules/extensions/libglx.so (0x7f5df0cc0000+0x1d71d) [0x7f5df0cdd71d]
[   185.533] (EE) 6: /usr/lib/xorg/modules/extensions/libglx.so (0x7f5df0cc0000+0x1f015) [0x7f5df0cdf015]
[   185.533] (EE) 7: /usr/bin/Xorg (InitExtensions+0x41) [0x4a6041]
[   185.533] (EE) 8: /usr/bin/Xorg (0x400000+0x24a00) [0x424a00]
[   185.533] (EE) 9: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7f5df1fe4b05]
[   185.533] (EE) 10: /usr/bin/Xorg (0x400000+0x24f0f) [0x424f0f]
[   185.533] (EE) 
[   185.533] (EE) Segmentation fault at address 0x2200009760
[   185.533] (EE)