problems for starting X after upgrade to kernel-2.6.20-1.2319

[Eric Doutreleau]

well

i have an hp dc 7600 and after i upgrade to kernel-2.6.20-1.2319 i got 
the following messages when i start X

xauth:  creating new authority file /root/.serverauth.3205

X Window System Version 7.0.0
Release Date: 21 December 2005
X Protocol Version 11, Revision 0, Release 7.0
Build Operating System:Linux 2.6.9-42.0.8.ELsmp i686Red Hat, Inc.
Current Operating System: Linux citi-6234.int-evry.fr 2.6.20-1.2319.fc5 
#1 Mon M
ay 21 19:52:13 EDT 2007 i686
Build Date: 08 April 2007
         Before reporting problems, check http://wiki.x.org
         to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
         (++) from command line, (!!) notice, (II) informational,
         (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Fri Jun 15 11:07:21 2007
(==) Using config file: "/root/xorg.conf"

(WW) ****INVALID IO ALLOCATION**** b: 0x10c0 e: 0x10c7 correcting

    *** If unresolved symbols were reported above, they might not
    *** be the reason for the server aborting.

Backtrace:
0: X(xf86SigHandler+0x87) [0x80b8757]
1: [0xaea420]
2: /usr/lib/xorg/modules/drivers/i810_drv.so [0x8deb08]
3: /usr/lib/xorg/modules/drivers/i810_drv.so [0x8e2512]
4: X(InitOutput+0x99a) [0x80a237a]
5: X(main+0x276) [0x806ffc6]
6: /lib/libc.so.6(__libc_start_main+0xdc) [0x26b4e4]
7: X(FontFileCompleteXLFD+0xb1) [0x806f511]

Fatal server error:
Caught signal 11.  Server aborting

XIO:  fatal IO error 104 (Connection reset by peer) on X server ":0.0"
       after 0 requests (0 known processed) with 0 events remaining.

if i boot to the previous kernel i have no problems and it work perfectly.

does anyone has some kind of problem like this?

thanks in advance for any help