startx 

Xauth : creating new authority file /root/.serverauth.2413
Xauth : (stdin):2: unknown command "35752a47149386c9f957d3ac4083528d"


Fatal server error :
Server is already active for display 0
If this server is no longer running, remove /tmp/.X0-lock and start again

Xlib : connection to ":0.0" refused by server
Xlib : Invalid MIT-MAGIC-COOKIE-1 key giving up
xinit : unable to connect to X Server
xinit : No such process (errno 3) : Server error 

rm /tmp/.X0-lock -y
startx 

cat /etc/inittab | grep initdefault
# 0 - halt (Do NOT set initdefault to this)
# 6 - reboot (Do NOT set initdefault to this)
id:5:initdefault: 

Khi boot bạn có gặp suggestive error message nào không ? 

Bạn kiểm tra lại file /etc/security/console.perms 

# /etc/security/console.perms
#
# This file determines the permissions that will be given to priviledged
# users of the console at login time, and the permissions to which to
# revert when the users log out.

# format is:
# <class>=list of regexps specifying consoles or globs specifying files
# file-glob|<class> perm dev-regex|<dev-class> \
# revert-mode revert-owner[.revert-group]
# the revert-mode, revert-owner, and revert-group are optional, and default
# to 0600, root, and root, respectively.
#
# For more information:
# man 5 console.perms
#
# This file should not be modified.
# Rather a new file in the console.perms.d directory should be created.

# file classes -- these are regular expressions
<console>=tty[0-9][0-9]* vc/[0-9][0-9]* :[0-9]\.[0-9] :[0-9]
<xconsole>=:[0-9]\.[0-9] :[0-9]

# device classes -- see console.perms.d/50-default.perms
# permission definitions -- see console.perms.d/50-default.perms 

# device classes -- these are shell-style globs
<floppy>=/dev/fd[0-1]* \
/dev/floppy* /mnt/floppy*
<sound>=/dev/dsp* /dev/audio* /dev/midi* \
/dev/mixer* /dev/sequencer* \
/dev/sound/* /dev/beep \
/dev/snd/* /dev/adsp*
<cdrom>=/dev/cdrom* /dev/cdroms/* /dev/cdwriter* /mnt/cdrom*
<pilot>=/dev/pilot
<jaz>=/mnt/jaz*
<zip>=/mnt/pocketzip* /mnt/zip* /dev/zip*
<ls120>=/dev/ls120 /mnt/ls120*
<scanner>=/dev/scanner* /dev/usb/scanner*
<rio500>=/dev/usb/rio500
<camera>=/mnt/camera* /dev/usb/dc2xx* /dev/usb/mdc800*
<memstick>=/mnt/memstick*
<flash>=/mnt/flash* /dev/flash*
<diskonkey>=/mnt/diskonkey*
<rem_ide>=/mnt/microdrive*
<fb>=/dev/fb /dev/fb[0-9]* \
/dev/fb/*
<kbd>=/dev/kbd
<joystick>=/dev/js[0-9]*
<v4l>=/dev/video* /dev/radio* /dev/winradio* /dev/vtx* /dev/vbi* \
/dev/video/*
<gpm>=/dev/gpmctl
<dri>=/dev/nvidia* /dev/3dfx* /dev/dri/card*
<mainboard>=/dev/apm_bios
<pmu>=/dev/pmu
<bluetooth>=/dev/rfcomm*
<raw1394>=/dev/raw1394
<irda>=/dev/ircomm*
<dvb>=/dev/dvb/adapter*/*

# permission definitions
<console> 0660 <floppy> 0660 root.floppy
<console> 0600 <sound> 0600 root
<console> 0600 <cdrom> 0660 root.disk
<console> 0600 <pilot> 0660 root.uucp
<console> 0600 <jaz> 0660 root.disk
<console> 0600 <zip> 0660 root.disk
<console> 0600 <ls120> 0660 root.disk
<console> 0600 <scanner> 0600 root
<console> 0600 <camera> 0600 root.disk
<console> 0600 <memstick> 0600 root.disk
<console> 0600 <flash> 0600 root.disk
<console> 0600 <diskonkey> 0660 root.disk
<console> 0600 <rem_ide> 0660 root.disk
<console> 0600 <fb> 0600 root
<console> 0600 <kbd> 0600 root
<console> 0600 <joystick> 0600 root
<console> 0600 <v4l> 0600 root
<console> 0700 <gpm> 0700 root
<console> 0600 <mainboard> 0600 root
<console> 0600 <rio500> 0600 root
<console> 0600 <pmu> 0600 root
<console> 0600 <bluetooth> 0600 root
<console> 0600 <raw1394> 0600 root
<console> 0600 <irda> 0600 root
<console> 0600 <dvb> 0600 root

<xconsole> 0600 /dev/console 0600 root.root
<console> 0600 <dri> 0600 root 

VGA của mình không phải là nVidia, và trong /dev cũng không có nvidia*. 

<v4l>=/dev/video* /dev/radio* /dev/winradio* /dev/vtx* /dev/vbi* \
/dev/video/*
<gpm>=/dev/gpmctl
<dri>=/dev/nvidia* /dev/3dfx* /dev/dri/card*  

<cdrom>=/dev/cdrom* /dev/cdroms/* /dev/cdwriter* /mnt/cdrom*  

Tất nhiên nó chỉ là default, nhưng bạn dùng VGA gì, đã cài driver cho nó chưa ? 

Bạn có thể chỉ cho mình cách kiểm tra xem những device nào đã được cài driver, những cái nào chưa được cài không ? Bởi vì mình mới bắt đầu tìm hiểu về *nix.
 

# Xorg configuration created by pyxf86config

Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "trident"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection 

[root@home ~]# man xorgcfg
No manual entry for xorgcfg
[root@home ~]# man xorg
No manual entry for xorg 

http://fedoraproject.org/ 

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