Radeon 7000 Dualhead 3D working - HOWTO

[Hans du Plooy <koffiejunkielistlurker@koffiejunkie.za.net>]

OK, after som head_against_wall incidentes, I have it working on Debian
Etch.  This should work for the Radeon 7500 too, because they use the
same driver.

First, make sure you have these packages installed:

xserver-xorg xserver-xorg-video-ati xlibmesa-gl xlibmesa-dri xfonts-base
libxinerama1 

I'm not sure if they're all strictly neccessary, but it won't hurt to
have them.  Anything else you need will probably be installed
automatically along the way.

Then, adapt your /etc/X11/xorg.conf to look something like this:

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    "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"     "gb"
EndSection

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

Section "Device"
        Identifier      "Card1"
        Driver          "radeon"
        BusID           "PCI:1:0:0"
        Option          "MergedFB" "true"
        Option          "CRT2Position" "LeftOf"
        Option          "MonitorLayout" "LCD, CRT"
        Option          "CRT2Hsync" "31-83"
        Option          "CRT2VRefresh" "50-75"
        Option          "OverlayOnCRTC2" "true"
        Option          "MetaModes" "1280x1024-1280x1024"
        Option          "MergedXineramaCRT2IsScreen0" "true"
EndSection

Section "Monitor"
        Identifier      "DELL1"
        Option          "DPMS"
        HorizSync       31-83
        VertRefresh     56-76
EndSection

Section "Screen"
        Identifier      "Screen1"
        Device          "Card1"
        Monitor         "DELL1"
        DefaultDepth    24
        SubSection "Display"
                Depth           24
                Modes           "1280x1024"
                Virtual 2560 1024
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          "Screen1"
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
EndSection

Section "DRI"
        Mode    0666
EndSection