cannot startx on an Itanium IA64

[De Leeuw Guy]

Hello

I run debian etch on our Itanium server (Bull novascale 4040) .
I cannot startx : here the lspci :

root at nova:~# lspci -vvv -s 01:01.0
01:01.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
(prog-if 00 [VGA])
        Subsystem: Intel Corporation Unknown device 3402
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping+ SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 64 (2000ns min), Cache Line Size: 128 bytes
        Region 0: Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: I/O ports at 6800 [size=256]
        Region 2: Memory at fbfd0000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at fbfa0000 [disabled] [size=128K]
        Capabilities: [5c] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-

root at nova:~#

Could you help me ?
Thanks in advance
Guy

my Xorg log file and xorg.conf:
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