external VGA output of an iBook G3 800 MHz 12 inch running Debian GNU/Linux 4.0

["Pierre Bauduin" <pierre@baudu.in>]

Hello,

I have bought a mini-VGA to VGA adapter for my iBook G3 800 MHz 12 inch.

When I use the adapter to connect an external VGA display to my iBook G3:
- in Mac OS X, everything is fine, I can see my desktop both on the iBook LCD display and on the external VGA display
- in Debian GNU/Linux, I can see my desktop on the iBook LCD display, but I see nothing but a dark screen on the external VGA display

Here is my /etc/X11/xorg.conf:
I have already modified it in order to support an external VGA display.

##############################################
# /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/fonts/X11/misc"
    FontPath    "/usr/X11R6/lib/X11/fonts/misc"
    FontPath    "/usr/share/fonts/X11/cyrillic"
    FontPath    "/usr/X11R6/lib/X11/fonts/cyrillic"
    FontPath    "/usr/share/fonts/X11/100dpi/:unscaled"
    FontPath    "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
    FontPath    "/usr/share/fonts/X11/75dpi/:unscaled"
    FontPath    "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
    FontPath    "/usr/share/fonts/X11/Type1"
    FontPath    "/usr/X11R6/lib/X11/fonts/Type1"
    FontPath    "/usr/share/fonts/X11/100dpi"
    FontPath    "/usr/X11R6/lib/X11/fonts/100dpi"
    FontPath    "/usr/share/fonts/X11/75dpi"
    FontPath    "/usr/X11R6/lib/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    "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"    "pc104"
    Option        "XkbLayout"    "us"
EndSection

Section "InputDevice"
    Identifier    "Configured Mouse"
    Driver        "mouse"
    Option        "CorePointer"
    Option        "Device"        "/dev/input/mice"
    Option        "Protocol"        "ImPS/2"
    Option        "Emulate3Buttons"    "true"
EndSection

Section "InputDevice"
    Identifier    "Synaptics Touchpad"
    Driver        "synaptics"
    Option        "SendCoreEvents"    "true"
    Option        "Device"        "/dev/psaux"
    Option        "Protocol"        "auto-dev"
    Option        "HorizScrollDelta"    "0"
EndSection

Section "Device"
    Identifier    "ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]"
    Driver        "ati"
    BusID        "PCI:0:16:0"
    Option        "UseFBDev"        "true"
EndSection

Section "Monitor"
    Identifier    "iBook Color LCD"
    Option        "DPMS"
EndSection

# Ajout Pierre Bauduin
# Le 1er mai 2007
Section "Monitor"
    identifier "Generic Monitor"
    vendorname "Plug 'n' Play"
    modelname "Plug 'n' Play"
    modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
    modeline "800x600@72" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync
    modeline "1024x768@70" 75.0 1024 1048 1184 1328 768 771 777 806 -vsync -hsync
    gamma 1.0
EndSection
#


Section "Screen"
    Identifier    "iBook Screen"
    Device        "ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]"
    Monitor        "iBook Color LCD"
    DefaultDepth    24
    SubSection "Display"
        Depth        1
        Modes        "1024x768"
    EndSubSection
    SubSection "Display"
        Depth        4
        Modes        "1024x768"
    EndSubSection
    SubSection "Display"
        Depth        8
        Modes        "1024x768"
    EndSubSection
    SubSection "Display"
        Depth        15
        Modes        "1024x768"
    EndSubSection
    SubSection "Display"
        Depth        16
        Modes        "1024x768"
    EndSubSection
    SubSection "Display"
        Depth        24
        Modes        "1024x768"
    EndSubSection
EndSection

# Ajouté par Pierre Bauduin
# Le 1er mai 2007
Section "Screen"
    Identifier "Default Screen"
    Device    "ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]"
    Monitor "Generic Monitor"
    DefaultDepth 24
SubSection "Display"
    depth 24
    virtual 1024 768
    # modes "640x480@60"
    # modes "800x600@72"
    modes "1024x768@70"
    EndSubSection
EndSection
#

Section "ServerLayout"
    Identifier    "Default Layout"
    Screen        "Default Screen"
    InputDevice    "Generic Keyboard"
    InputDevice    "Configured Mouse"
    InputDevice    "Synaptics Touchpad"
EndSection

Section "DRI"
    Mode    0666
EndSection
#############################

Any help would be appreciated,

Thank you,
-- 
Pierre Bauduin
Linux enthusiast since 1996
Linux registered user #64711
Debian GNU/Linux user