如何生成xorg.conf？（X-配置段错误）

我的视频卡工作正常，没有屏幕问题。
我试图生成一个xorg.conf，所以我做到了：

[ Logout ]
sudo service gdm stop
[ Move away xorg.conf.back and xorg.conf.fglrx-0 that were in /etc/X11 ]
sudo dpkg-reconfigure xserver-xorg
sudo X -configure

但是，这最后一个命令出现了段错误：

X.Org X Server 1.7.6
Release Date: 2010-03-17
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-27-server i686 Ubuntu
Current Operating System: Linux nico 2.6.32-25-generic #44-Ubuntu SMP Fri Sep 17 20:26:08 UTC 2010 i686
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.32-25-generic root=UUID=7447ab16-3406-442d-81e5-bb6a2d795205 ro quiet splash
Build Date: 21 July 2010  12:47:34PM
xorg-server 2:1.7.6-2ubuntu7.3 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.16.4
 Before reporting problems, check http://wiki.x.org
 to make sure that you have the latest version.
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 Oct 15 16:06:11 2010
List of video drivers:
 i740
 ark
 geode
 siliconmotion
 mach64
 s3
 r128
 apm
 intel
 neomagic
 vesa
 trident
 chips
 s3virge
 fglrx
 sis
 savage
 rendition
 i128
 tseng
 ztv
 mga
 openchrome
 radeon
 ati
 nv
 v4l
 vmware
 cirrus
 tdfx
 nouveau
 sisusb
 voodoo
 fbdev
(EE) Can't load FireGL DRM library (libfglrxdrm.so).

Backtrace:
0: X (xorg_backtrace+0x3b) [0x80e938b]
1: X (0x8048000+0x61c8d) [0x80a9c8d]
2: (vdso) (__kernel_rt_sigreturn+0x0) [0x34d410]
3: X (xf86CallDriverProbe+0x182) [0x80b82d2]
4: X (DoConfigure+0x1c8) [0x816b898]
5: X (InitOutput+0x1da) [0x80b98aa]
6: X (0x8048000+0x1ebbb) [0x8066bbb]
7: /lib/tls/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0x467bd6]
8: X (0x8048000+0x1e961) [0x8066961]
Segmentation fault at address (nil)

Caught signal 11 (Segmentation fault). Server aborting

Please consult the The X.Org Foundation support 
  at http://wiki.x.org
 for help. 
Please also check the log file at "/var/log/Xorg.0.log" for additional information.

 ddxSigGiveUp: Closing log

注意行 Can't load FireGL DRM library (libfglrxdrm.so)

注意：我有文件 /usr/lib/fglrx/xorg/modules/linux/libfglrxdrm.so

奇怪的是，它存在段错误，而我可以毫无问题地使用Gnome，但是很好……
可能与之相关：我最近尝试从ATI网站安装驱动程序，然后glxgears开始崩溃。

在这些情况下如何生成xorg.conf？
它可能涉及也可能不涉及解决段故障问题。