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Old 08-26-2005, 03:51 AM   #1
Registered: Nov 2003
Distribution: Slackware 11.0, FreeBSD
Posts: 284

Rep: Reputation: 30
Dual Monitors - One Video Card

I have a notebook and a spare 17" CRT lying around, and i was thinking of using the vga port at the back of the notebook to connect to the 17". I don't know how to put this, but is there a way i can use the 2nd monitor in a dual-screen setup, e.g. increase my resoultion from 1024X768 to 2048x768. i tried tweaking my xorg.conf but the only thing i'm getting on the 17" crt is the duplication of the lcd screen on the notebook.
here's a copy of my xorg.conf

Section "Files"
RgbPath	"/usr/X11R6/lib/X11/rgb"
FontPath   "/usr/X11R6/lib/X11/fonts/misc/"
FontPath   "/usr/X11R6/lib/X11/fonts/TTF/"
FontPath   "/usr/X11R6/lib/X11/fonts/Type1/"
FontPath   "/usr/X11R6/lib/X11/fonts/CID/"
FontPath   "/usr/X11R6/lib/X11/fonts/75dpi/"
FontPath   "/usr/X11R6/lib/X11/fonts/100dpi/"
FontPath   "/usr/X11R6/lib/X11/fonts/local/"
FontPath   "/usr/X11R6/lib/X11/fonts/Speedo/"
FontPath   "/usr/X11R6/lib/X11/fonts/cyrillic/"

Section "InputDevice"
Identifier "Keyboard1"
Driver	"kbd"
Option "AutoRepeat" "500 30"
Option "XkbRules"	"xorg"
Option "XkbModel"	"pc101"
Option "XkbLayout"	"us"

Section "InputDevice"
Identifier	"Mouse1"
Driver	"mouse"
Option "Protocol"    "Auto"
Option "Device"      "/dev/mouse"
Option "ZAxisMapping" "4 5"
Option "Buttons" "3"
Option "EmulateWheel"   "true"
Option "EmulateWheelButton" "2"
Option "Emulate3Buttons"

Section "Monitor"
Identifier  "monitor0"
HorizSync   31.5 - 57.0
VertRefresh 40 - 75
Option "DPMS"

Section "Monitor"
Identifier "monitor1"
Option      "DPMS"

Section "Device"
    Identifier	"Standard VGA"
    VendorName	"Unknown"
    BoardName	"Unknown"
    Driver     "vga"

Section "Device"
    Identifier  "** Silicon Motion (generic)           [siliconmotion]"
    Driver      "siliconmotion"

Section "Screen"
    Identifier  "Screen0"
    Device      "** Silicon Motion (generic)           [siliconmotion]"
    Monitor     "monitor0"
    DefaultDepth 24
    Subsection "Display"
        Depth       24
        Modes       "1280x1024" "1024x768" "800x600" "640x480"
        ViewPort    0 0
Section "Screen"
Identifier "Screen1"
Device      "Standard VGA"
Monitor "monitor1"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1024x768"

Section "ServerLayout"
Identifier "SimpleLayout"
Screen "Screen0" 0 0
Screen "Screen1" LeftOf "Screen0"
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard1" "CoreKeyboard"

Section "ServerFlags"
Option "Xinerama" "True"
Any help would be gladly appreciated.

Old 08-26-2005, 05:29 AM   #2
Registered: Apr 2005
Location: Havant, Hampshire, UK
Distribution: Slamd64, Slackware, PS2Linux
Posts: 465

Rep: Reputation: 44
If I understand correctly, you're looking for desktop extension. nVidia cards have a function called "TwinView" which does this, aTi have something equivalent.

A few things you need to look at:

* These extended desktops are the function of hardware and (usually) vendor drivers. You're using the VGA driver. To my knowledge, this won't work.
* lspci - does the other output show up separately? (Not sure this is relevant, actually)
* I've never heard of Silicon Motion, but searches indicate that they make graphics co-processors. We need more information on your card.

So, the short answer to the question: "Can I use this notebook + 17" CRT in a dual monitor configuration?" is "Depends ... "

- Piete
Old 08-26-2005, 06:02 AM   #3
Senior Member
Registered: Jun 2004
Location: Argentina (SR, LP)
Distribution: Slackware
Posts: 3,145

Rep: Reputation: 51
Try using Option "Xinerama" "true" instead of Option "Xinerama" "True".
I never tested if X check that far for characters cases, but worth to try

From xorg.conf man page:
The following boolean option values are recognised as TRUE:
1, on, true, yes
Edit: Damn, I answer to fast...
Config file keywords are case-insensitive, and "_" characters are ignored. Most strings (including Option names) are also case-insensitive, and insensitive to white space and "_" characters.
It says most

Check this ones too see if you spot a diference:

Last edited by gbonvehi; 08-26-2005 at 06:12 AM.


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