I have a dual screen setup on SLED, and after an update, it killed my X system. After disabling XRandR… <blockquote>aticonfig –set-pcs-str=”DDX,EnableRandR12,FALSE”</blockquote> …and redoing xorg.conf from scratch via… <blockquote>xorgconfig</blockquote> …I was finally able to get my dual monitors working again. Here is my xorg.conf:

<blockquote>Section “ServerLayout”

# The Identifier line must be present
# Each Screen line specifies a Screen section name, and optionally
# the relative position of other screens. The four names after
# primary screen name are the screens to the top, bottom, left and right
# of the primary screen. In this example, screen 2 is located to the
# right of screen 1.
# Each InputDevice line specifies an InputDevice section name and
# optionally some options to specify the way the device is to be
# used. Those options include “CorePointer”, “CoreKeyboard” and
# “SendCoreEvents”.
Identifier “Simple Layout”
Screen 0 “aticonfig-Screen[0]-0” 0 0
InputDevice “Mouse1” “CorePointer”
InputDevice “Keyboard1” “CoreKeyboard”
EndSection

Section “Files”

# Multiple FontPath entries are allowed (which are concatenated together),
# as well as specifying multiple comma-separated entries in one FontPath
# command (or a combination of both methods)
#
# FontPath “/usr/share/fonts/TTF/”
# FontPath “/usr/share/fonts/OTF”
# FontPath “/usr/lib/X11/fonts/local/”
# FontPath “/usr/lib/X11/fonts/misc/:unscaled”
# FontPath “/usr/lib/X11/fonts/75dpi/:unscaled”
# FontPath “/usr/lib/X11/fonts/100dpi/:unscaled”
# FontPath “/usr/lib/X11/fonts/Type1/”
# FontPath “/usr/lib/X11/fonts/TrueType/”
# FontPath “/usr/lib/X11/fonts/freefont/”
# The module search path. The default path is shown here.
# ModulePath “/usr/lib/modules”
FontPath “/usr/share/fonts/misc:unscaled”
FontPath “/usr/share/fonts/Type1/”
FontPath “/usr/share/fonts/100dpi:unscaled”
FontPath “/usr/share/fonts/75dpi:unscaled”
EndSection

Section “Module”

# This loads the DBE extension module.
# This loads the miscellaneous extensions module, and disables
# initialisation of the XFree86-DGA extension within that module.
# This loads the font modules
# Load “type1”
# This loads the GLX module
# Load “glx”
# This loads the DRI module
# Load “dri”
Load “dbe” # Double buffer extension
SubSection “extmod”
Option “omit xfree86-dga” # don’t initialise the DGA extension
EndSubSection
Load “freetype”
# Load “xtt”
EndSection

Section “InputDevice”

# Option “Xleds” “1 2 3”
# Option “LeftAlt” “Meta”
# Option “RightAlt” “ModeShift”
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option “XkbModel” “pc105”
# If you have a US Microsoft Natural keyboard, you can use:
# Option “XkbModel” “microsoft”
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option “XkbLayout” “de”
# or:
# Option “XkbLayout” “de”
# Option “XkbVariant” “nodeadkeys”
#
# If you’d like to switch the positions of your capslock and
# control keys, use:
# Option “XkbOptions” “ctrl:swapcaps”
# These are the default XKB settings for Xorg
# Option “XkbRules” “xorg”
# Option “XkbModel” “pc105”
# Option “XkbLayout” “us”
# Option “XkbVariant” ““
# Option “XkbOptions” ““
# Option “XkbDisable”
Identifier “Keyboard1”
Driver “kbd”
Option “AutoRepeat” “500 30”
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
Option “XkbRules” “xorg”
Option “XkbModel” “pc101”
Option “XkbLayout” “us”
EndSection

Section “InputDevice”

# Identifier and driver
# Option “Resolution” “256”
# Baudrate and SampleRate are only for some Logitech mice. In
# almost every case these lines should be omitted.
# Option “BaudRate” “9600”
# Option “SampleRate” “150”
# Mouse wheel mapping. Default is to map vertical wheel to buttons 4 & 5,
# horizontal wheel to buttons 6 & 7. Change if your mouse has more than
# 3 buttons and you need to map the wheel to different button ids to avoid
# conflicts.
# Emulate3Timeout is the timeout in milliseconds (default is 50ms)
# Option “Emulate3Buttons”
# Option “Emulate3Timeout” “50”
# ChordMiddle is an option for some 3-button Logitech mice
# Option “ChordMiddle”
Identifier “Mouse1”
Driver “mouse”
Option “Protocol” “Auto” # Auto detect
Option “Device” “/dev/input/mice”
# Mouse-speed setting for PS/2 mouse.
Option “ZAxisMapping” “4 5 6 7”
# Emulate3Buttons is an option for 2-button mice
EndSection

Section “Monitor”

# HorizSync is in kHz unless units are specified.
# HorizSync may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR’S
# USER MANUAL FOR THE CORRECT NUMBERS.
# HorizSync 30-64 # multisync
# HorizSync 31.5, 35.2 # multiple fixed sync frequencies
# HorizSync 15-25, 30-50 # multiple ranges of sync frequencies
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR’S
# USER MANUAL FOR THE CORRECT NUMBERS.
Identifier “sammysung”
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
EndSection

Section “Monitor”
Identifier “aticonfig-Monitor[0]-0”
Option “VendorName” “ATI Proprietary Driver”
Option “ModelName” “Generic Autodetecting Monitor”
Option “DPMS” “true”
EndSection

Section “Monitor”
Identifier “aticonfig-Monitor[0]-1”
Option “VendorName” “ATI Proprietary Driver”
Option “ModelName” “Generic Autodetecting Monitor”
Option “DPMS” “true”
EndSection

Section “Device”

# The chipset line is optional in most cases. It can be used to override
# the driver’s chipset detection, and should not normally be specified.
# Chipset “generic”
# The Driver line must be present. When using run-time loadable driver
# modules, this line instructs the server to load the specified driver
# module. Even when not using loadable driver modules, this line
# indicates which driver should interpret the information in this section.
# The BusID line is used to specify which of possibly multiple devices
# this section is intended for. When this line isn’t present, a device
# section can only match up with the primary video device. For PCI
# devices a line like the following could be used. This line should not
# normally be included unless there is more than one video device
# intalled.
# BusID “PCI:0:10:0”
# VideoRam 256
# Clocks 25.2 28.3
Identifier “Standard VGA”
Driver “vga”
VendorName “Unknown”
BoardName “Unknown”
EndSection

Section “Device”

#VideoRam 32768
# Insert Clocks lines here if appropriate
Identifier “atisammy”
Driver “radeon”
EndSection

Section “Device”
Identifier “aticonfig-Device[0]-0”
Driver “fglrx”
BusID “PCI:1:0:0”
EndSection

Section “Device”
Identifier “aticonfig-Device[0]-1”
Driver “fglrx”
BusID “PCI:1:0:0”
Screen 1
EndSection

Section “Screen”
Identifier “Screen 1”
Device “atisammy”
Monitor “sammysung”
DefaultDepth 24
SubSection “Display”
Viewport 0 0
Depth 8
Modes “1280x1024” “1024x768” “800x600” “640x480”
EndSubSection
SubSection “Display”
Viewport 0 0
Depth 16
Modes “1280x1024” “1024x768” “800x600” “640x480”
EndSubSection
SubSection “Display”
Viewport 0 0
Depth 24
Modes “1280x1024” “1024x768” “800x600” “640x480”
EndSubSection
EndSection

Section “Screen”
Identifier “aticonfig-Screen[0]-0”
Device “aticonfig-Device[0]-0”
Monitor “aticonfig-Monitor[0]-0”
DefaultDepth 24
SubSection “Display”
Viewport 0 0
Depth 24
EndSubSection
EndSection

Section “Screen”
Identifier “aticonfig-Screen[0]-1”
Device “aticonfig-Device[0]-1”
Monitor “aticonfig-Monitor[0]-1”
DefaultDepth 24
SubSection “Display”
Viewport 0 0
Virtual 2560 1024
Depth 24
EndSubSection
EndSection

</blockquote>