$ LIBGL_DEBUG=verbose fglrxinfo
libGL: XF86DRIGetClientDriverName: 8.27.10 fglrx (screen 0)
libGL: OpenDriver: trying /usr/lib/dri/fglrx_dri.so
libGL error: dlopen /usr/lib/dri/fglrx_dri.so failed (/usr/lib/dri/fglrx_dri.so: undefined symbol: __glXFindDRIScreen)
libGL error: unable to find driver: fglrx_dri.so
display: :0.0  screen: 0
OpenGL vendor string: Mesa project: www.mesa3d.org
OpenGL renderer string: Mesa GLX Indirect
OpenGL version string: 1.2 (1.5 Mesa 6.4.2)

exerpt from /var/log/Xorg.0.log:
II) fglrx(0): [drm] DRM interface version 1.0
(II) fglrx(0): [drm] created "fglrx" driver at busid "PCI:1:0:0"
(II) fglrx(0): [drm] added 8192 byte SAREA at 0x2000
(II) fglrx(0): [drm] mapped SAREA 0x2000 to 0xa6fa2000
(II) fglrx(0): [drm] framebuffer handle = 0x3000
(II) fglrx(0): [drm] added 1 reserved context for kernel
(II) fglrx(0): DRIScreenInit done
(II) fglrx(0): Kernel Module Version Information:
(II) fglrx(0):     Name: fglrx
(II) fglrx(0):     Version: 8.27.10
(II) fglrx(0):     Date: Jul 27 2006
(II) fglrx(0):     Desc: ATI FireGL DRM kernel module
(II) fglrx(0): Kernel Module version matches driver.
(II) fglrx(0): Kernel Module Build Time Information:
(II) fglrx(0):     Build-Kernel UTS_RELEASE:        2.6.16-2-k7-smp
(II) fglrx(0):     Build-Kernel MODVERSIONS:        no
(II) fglrx(0):     Build-Kernel __SMP__:            no
(II) fglrx(0):     Build-Kernel PAGE_SIZE:          0x1000
(II) fglrx(0): [drm] register handle = 0x00004000
(II) fglrx(0): [pcie] 131072 kB allocated with handle 0xdeadbeef
(II) fglrx(0): [drm] ringbuffer size = 0x00100000 bytes
(II) fglrx(0): [drm] DRM buffer queue setup: nbufs = 100 bufsize = 65536
(II) fglrx(0): [drm] texture shared area handle = 0x00008000
(II) fglrx(0): shared FSAAScale=1
(II) fglrx(0): DRI initialization successfull!
(II) fglrx(0): FBADPhys: 0xc0000000 FBMappedSize: 0x00701000
(II) fglrx(0): FBMM initialized for area (0,0)-(1280,1434)
(II) fglrx(0): FBMM auto alloc for area (0,0)-(1280,1024) (front color buffer - assumption)
(==) fglrx(0): Backing store disabled
(==) fglrx(0): Silken mouse enabled
(**) fglrx(0): DPMS enabled
(WW) fglrx(0): Option "VendorName" is not used
(WW) fglrx(0): Option "ModelName" is not used
(II) fglrx(0): Using XFree86 Acceleration Architecture (XAA)
        Screen to screen bit blits
        Solid filled rectangles
        8x8 mono pattern filled rectangles
        Solid Lines
        Dashed Lines
        Offscreen Pixmaps
        Setting up tile and stipple cache:
                30 128x128 slots
(II) fglrx(0): Acceleration enabled
(II) fglrx(0): X context handle = 0x1
(II) fglrx(0): [DRI] installation complete
(II) fglrx(0): Direct rendering enabled
(==) fglrx(0): Using hardware cursor
(II) fglrx(0): Largest offscreen area available: 1280 x 410
(II) Loading extension FGLRXEXTENSION
(II) Loading extension ATITVOUT
(II) fglrx(0): Interrupt handler installed at IRQ 193.
(II) fglrx(0): Exposed events to the /proc interface
(==) RandR enabled
(II) Initializing built-in extension MIT-SHM