Configurare xorg.conf per dual-head o clone con schede Intel 945GM

Questa guida ha la scopo di aiutare chi possiede un pc con grafica integrata intel 945GM nella configurazione dello xorg.conf al fine di ottenere o l’uso della funzione clone (stesso desktop ue schermi) con un monitor/proiettore esterno o quello della funzione dual-head per visualizzare due desktop differenti su due differenti schermi/proiettore.
Da sottolineare che per alcune cause, sembra limiti dei driver Linux, la seconda modalità di visualizzazione permette di impostare una sola risoluzione per entrambe gli schermi è importante quindi l’adozione di uno schermo non principale di tipo compatibile a quello primario per non ritrovarsi con una immagine troppo degradata per essere utilizzabile o con frequenze di refresh fastidiose.

Modalità clone
nella modalità clone il vostro xorg deve essere configurato come segue:

# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type “man /etc/X11/xorg.conf” at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section “Files”
FontPath “/usr/share/X11/fonts/misc”
FontPath “/usr/share/X11/fonts/cyrillic”
FontPath “/usr/share/X11/fonts/100dpi/:unscaled”
FontPath “/usr/share/X11/fonts/75dpi/:unscaled”
FontPath “/usr/share/X11/fonts/Type1”
FontPath “/usr/share/X11/fonts/100dpi”
FontPath “/usr/share/X11/fonts/75dpi”
# path to defoma fonts
FontPath “/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType”
EndSection

Section “Module”
Load “i2c”
Load “bitmap”
Load “ddc”
Load “extmod”
Load “freetype”
Load “int10”
Load “vbe”
Load “glx”
Load “dri”
EndSection

Section “InputDevice”
Identifier “Generic Keyboard”
Driver “kbd”
Option “CoreKeyboard”
Option “XkbRules” “xorg”
Option “XkbModel” “pc105”
Option “XkbLayout” “it”
EndSection

Section “InputDevice”
Identifier “Configured Mouse”
Driver “mouse”
Option “CorePointer”
Option “Device” “/dev/input/mice”
Option “Protocol” “ImPS/2”
Option “ZAxisMapping” “4 5”
Option “Emulate3Buttons” “true”
EndSection

Section “InputDevice”
Driver “wacom”
Identifier “stylus”
Option “Device” “/dev/input/wacom”
Option “Type” “stylus”
Option “ForceDevice” “ISDV4” # Tablet PC ONLY
EndSection

Section “InputDevice”
Driver “wacom”
Identifier “eraser”
Option “Device” “/dev/input/wacom”
Option “Type” “eraser”
Option “ForceDevice” “ISDV4” # Tablet PC ONLY
EndSection

Section “InputDevice”
Driver “wacom”
Identifier “cursor”
Option “Device” “/dev/input/wacom”
Option “Type” “cursor”
Option “ForceDevice” “ISDV4” # Tablet PC ONLY
EndSection

Section “Device”
Identifier “Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller”
Boardname “Intel 945”
Busid “PCI:0:2:0”
Driver “i810”
Option “DevicePresence” “On”
Screen 0
Vendorname “Intel”
Option “MonitorLayout” “CRT, CRT+LFP”
Option “Clone” “on”
EndSection

Section “Monitor”
Identifier “Monitor Generico”
Option “DPMS”
HorizSync 28-64
VertRefresh 43-60
EndSection

Section “Monitor”
Identifier “CRT”
ModelName “External Device”
Option “DPMS”
HorizSync 28-51
VertRefresh 43-60
EndSection

Section “Screen”
Identifier “Default Screen”
Device “Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller”
Monitor “Monitor Generico”
DefaultDepth 24
SubSection “Display”
Depth 1
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 4
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 8
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 15
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 16
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 24
Modes “1280×800”
EndSubSection
EndSection

Section “Screen”
Identifier “CRT-Screen”
Device “Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller”
Monitor “CRT”
DefaultDepth 24
SubSection “Display”
Depth 16
Modes “1024×768”
EndSubSection
SubSection “Display”
Depth 24
Modes “1024×768”
EndSubSection
EndSection

Section “ServerLayout”
Identifier “Multihead”
Screen 0 “Default Screen” 0 0
Screen 0 “CRT-Screen” 0 0
# option “Xinerama” “on”
# option “AIGLX” “true”
InputDevice “Generic Keyboard”
InputDevice “Configured Mouse”
InputDevice “stylus” “SendCoreEvents”
InputDevice “cursor” “SendCoreEvents”
InputDevice “eraser” “SendCoreEvents”
EndSection

Section “DRI”
Mode 0666
EndSection

La configurazione è già pronta per la scheda Intel sopra citata è comunque una linea guida di come deve essere impostato uno xorg per ottenere lo stesso effetto su schede di tipo diverso.
Lo stesso discorso vale anche per la configurazione che segue.

Modalità Dual-head

# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf(5) manual page.
# (Type “man xorg.conf” at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section “Files”
FontPath “/usr/share/fonts/X11/misc”
FontPath “/usr/share/fonts/X11/cyrillic”
FontPath “/usr/share/fonts/X11/100dpi/:unscaled”
FontPath “/usr/share/fonts/X11/75dpi/:unscaled”
FontPath “/usr/share/fonts/X11/Type1”
FontPath “/usr/share/fonts/X11/100dpi”
FontPath “/usr/share/fonts/X11/75dpi”
# path to defoma fonts
FontPath “/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType”
EndSection

Section “Module”
Load “i2c”
Load “bitmap”
Load “ddc”
Load “dri”
Load “extmod”
Load “freetype”
Load “glx”
Load “int10”
Load “vbe”
EndSection

Section “InputDevice”
Identifier “Generic Keyboard”
Driver “kbd”
Option “CoreKeyboard”
Option “XkbRules” “xorg”
Option “XkbModel” “pc105”
Option “XkbLayout” “it”
EndSection

Section “InputDevice”
Identifier “Configured Mouse”
Driver “mouse”
Option “CorePointer”
Option “Device” “/dev/input/mice”
Option “Protocol” “ImPS/2”
Option “ZAxisMapping” “4 5”
Option “Emulate3Buttons” “true”
EndSection

Section “InputDevice”
Driver “wacom”
Identifier “stylus”
Option “Device” “/dev/input/wacom”
Option “Type” “stylus”
Option “ForceDevice” “ISDV4” # Tablet PC ONLY
EndSection

Section “InputDevice”
Driver “wacom”
Identifier “eraser”
Option “Device” “/dev/input/wacom”
Option “Type” “eraser”
Option “ForceDevice” “ISDV4” # Tablet PC ONLY
EndSection

Section “InputDevice”
Driver “wacom”
Identifier “cursor”
Option “Device” “/dev/input/wacom”
Option “Type” “cursor”
Option “ForceDevice” “ISDV4” # Tablet PC ONLY
EndSection

Section “Device”
Identifier “Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller”
Driver “i810”
BusID “PCI:0:2:0”
Screen 0
Option “DevicePresence” “true”
Option “MonitorLayout” “CRT, DFP+LFP”
EndSection
Section “Device”
Identifier “Card1”
Driver “i810”
BusID “PCI:0:2:1”
Screen 1
Option “DevicePresence” “true”
Option “MonitorLayout” “CRT, DFP+LFP”
EndSection

Section “Monitor”
Identifier “Monitor Generico”
Option “DPMS”
HorizSync 28-64
VertRefresh 43-60
EndSection

Section “Monitor”
Identifier “Proiettore”
Option “DPMS”
HorizSync 28-64
VertRefresh 43-60
EndSection

Section “Screen”
Identifier “Default Screen”
Device “Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller”
Monitor “Monitor Generico”
DefaultDepth 24
SubSection “Display”
Depth 1
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 4
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 8
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 15
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 16
Modes “1280×800”
EndSubSection
SubSection “Display”
Depth 24
Modes “1280×800”
EndSubSection
EndSection

Section “Screen”
Identifier “Screen1”
Device “Card1”
Monitor “Proiettore”
DefaultDepth 24
SubSection “Display”
Depth 24
Modes “800×600”
EndSubSection
EndSection

Section “ServerLayout”
Identifier “Default Layout”
Screen “Screen1” LeftOf “Default Screen”
Screen “Default Screen”
InputDevice “Generic Keyboard”
InputDevice “Configured Mouse”
InputDevice “stylus” “SendCoreEvents”
InputDevice “cursor” “SendCoreEvents”
InputDevice “eraser” “SendCoreEvents”
Option “clone” “true”
EndSection

Section “DRI”
Mode 0666
EndSection

NOTA: è importante fare sempre una copia di backup del file xorg.conf nella sua configurazione originale prima di apportare qualsiasi modifica in modo da poter ripristinare il server grafico se le configurazioni sopra riportare non dovessero funzionare.

Ciao a tutti.