Version conflict between fglrx kernel module and Xorg

Binary package hint: linux-restricted-modules-2.6.15-27-386

Direct rendering does not work with ATI Radeon 9550 and proprietary fglrx driver. The reason seems to be that Xorg version is 7.0.0 while kernel module supports versions 6.8.x

Versions of related packages:
xserver-xorg: 7.0.0.ubuntu45
xorg-driver-fglrx: 7.0.0-8.25.18+2.6.15.12-1
linux-restricted-modules-2.6.15-27-386: 2.6.15.12-1

Interesting bits from /var/log/Xorg.log:
--snip--
II) Loading /usr/lib/xorg/modules/drivers/fglrx_drv.so
(II) Module fglrx: vendor="FireGL - ATI Technologies Inc."
        compiled for 6.8.99.8, module version = 8.25.18
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 0.7
--snip--
(II) Loading /usr/lib/xorg/modules/linux/libfglrxdrm.so
(II) Module fglrxdrm: vendor="FireGL - ATI Technologies Inc."
        compiled for 6.8.99.8, module version = 8.25.18
        ABI class: X.Org Server Extension, version 0.2
--snip--
(II) fglrx(0): UMM Bus area: 0xd8954000 (size=0x076ac000)
(II) fglrx(0): UMM area: 0xd8954000 (size=0x076ac000)
(II) fglrx(0): driver needs X.org 6.8.x.y with x.y >= 99.8
(II) fglrx(0): detected X.org 7.0.0.0
(WW) fglrx(0): ***********************************************
(WW) fglrx(0): * DRI initialization failed! *
(WW) fglrx(0): * (maybe driver kernel module missing or bad) *
(WW) fglrx(0): * 2D acceleraton available (MMIO) *
(WW) fglrx(0): * no 3D acceleration available *
(WW) fglrx(0): ********************************************* *
--snip--

Output of fglrxinfo:
Xlib: extension "XFree86-DRI" missing on display ":0.0".
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 6.4.1)

This may or may not be related to bug 42459.