Problem with Radeon X800 Pro

[KURGAN <nilshar at gmail dot com>]

Hello

I'm using fglrx on my laptop with no problem (THANKS !), so I recently
changed my video card on my desktop PC to a Radeon X800 Pro. and I
fail making 3D accel to work.

Using a debian unstable, custom kernel 2.6.14.2, fglrx 8.18.6-1 (I
tried 8.18.8 as well)
xorg 6.8.2.dfsg.1-10.
nforce3 chipset

lspci -v :
0000:01:00.0 VGA compatible controller: ATI Technologies Inc R420 JI
[Radeon X80 0PRO] (prog-if 00 [VGA])
       Subsystem: ATI Technologies Inc: Unknown device 0002
       Flags: bus master, 66MHz, medium devsel, latency 255, IRQ 11
       Memory at e0000000 (32-bit, prefetchable) [size=128M]
       I/O ports at 9800 [size=256]
       Memory at fe400000 (32-bit, non-prefetchable) [size=64K]
       Expansion ROM at fe8e0000 [disabled] [size=128K]
       Capabilities: [58] AGP version 3.0
       Capabilities: [50] Power Management version 2

0000:01:00.1 Display controller: ATI Technologies Inc: Unknown device 4a69
       Subsystem: ATI Technologies Inc: Unknown device 0003
       Flags: bus master, 66MHz, medium devsel, latency 64
       Memory at d8000000 (32-bit, prefetchable) [size=128M]
       Memory at fe8d0000 (32-bit, non-prefetchable) [size=64K]
       Capabilities: [50] Power Management version 2


Problems in xorg.log :
(WW) Ignoring request to load module GLcore
[...]
(WW) fglrx: No matching Device section for instance (BusID PCI:1:0:1) found
(--) Chipset RADEON X800 PRO (R420 4A49) found
[...]
(WW) fglrx(0): Specified desktop setup not supported: 8
[...]
(EE) fglrx(0): [agp] unable to acquire AGP, error "xf86_ENODEV"
(EE) fglrx(0): cannot init AGP
(II) fglrx(0): [drm] removed 1 reserved context for kernel
(II) fglrx(0): [drm] unmapping 8192 bytes of SAREA 0xf88ec000 at 0xb7afb000
(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): ********************************************* *

So according to flavio :
"The error unable to acquire AGP, error "xf86_ENOMEM" in your X server
log usually means that you are using the built-in AGP support with an
unsupported chipset. Set "UseInternalAGPGART" to "no" and load the
kernel driver (see below for details) which will hopefully support
your AGP chipset."

I tried to load nvidia_agp and setting "UseInternalAGPGART" to "no" =>
same result

about the
(WW) fglrx: No matching Device section for instance (BusID PCI:1:0:1) found
(--) Chipset RADEON X800 PRO (R420 4A49) found

I tried to set ChipID to 0x4a69 (lspci above) =>
(WW) fglrx: No matching Device section for instance (BusID PCI:1:0:1) found
(WW) fglrx: ChipID 0x4A69 in Device section "Carte vidéo générique"
isn't valid for this driver
(EE) No devices detected.

Not sure what to try next, so if you have an idea...

Thanks :)