Need help with TwinView

[vwfix]

I am trying to set up dual monitors with a nvidia 8400 GS
got the nvidia restricted drive set up, for some reason the system only sees vga and not the dvi, if I try to boot up with just the dvi it still does not work.
nvidia-settings does not see the second screen also.
and when I try to click the save xorg.conf in nvidia-settings i get this message

Unable to create new X config backup file '/etc/X11/xorg.conf.backup'.

Can someone help me configure the xorg file or give me a xorg file that will work, I am trying to run a dell 1907fp on the vga which works fine and a viewsonic VA2012wb on dvi and neither monitors get detected by the dvi.
Need help desperately.

[vwfix]

Well I finally got the twinview to work, the only issue now is the viewsonic will not go past the 640 resolution can someone look at xorg.conf and correct my mistake, also any clues why the nvidia-settings fails to save the xorg.conf file

Section "Device"
Identifier "0 nVidia Corporation G80 [GeForce 8400 GS]"
Driver "nvidia"
Screen 0
Option "TwinView" "True"
Option "TwinViewOrientation" "RightOf"
Option "UseEdidFreqs" "True"
Option "MetaModes" "1280x1024,1280x1024; 1024x768,1024x768"
Option "UseDisplayDevice" "CRT"#replace 'string' with either 'DFP' (Digital flat panel connected via DVI port), 'CRT' (any monitor that is connected via VGA ports), or 'TV'
Option "ConnectedMonitor" "DFP, CRT"
Option "AddARGBVisuals" "True"
Option "AddARGBGLXVisuals" "True"
Option "NoLogo" "True"
EndSection

Section "Device"
Identifier "1 nVidia Corporation G80 [GeForce 8400 GS]"
Driver "nvidia"
Screen 1
Option "TwinView" "True"
Option "TwinViewOrientation"
Option "UseEdidFreqs" "True"
Option "MetaModes" "1280x1024,1280x1024; 1024x768,1024x768"
Option "UseDisplayDevice" "DFP"#replace 'string' with either 'DFP' (Digital flat panel connected via DVI port), 'CRT' (any monitor that is connected via VGA ports), or 'TV'
Option "ConnectedMonitor" "DFP, CRT"
EndSection


Section "Monitor"
Identifier "DELL 1907FP"
Option "DPMS"
Horizsync 30-100
Vertrefresh 50-160
EndSection

Section "Monitor"
Identifier "DELL 1907FP 2"
Option "DFP"
Horizsync 30.0 - 82.0
Vertrefresh 50.0 - 75.0
EndSection

Section "Screen"
Identifier "Main Screen"
Device "0 nVidia Corporation G80 [GeForce 8400 GS]"
Monitor "DELL 1907FP"
Defaultdepth 24
SubSection "Display"
Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
Option "AddARGBGLXVisuals" "True"
EndSection

Section "Screen"
Identifier "Second Screen"
Device "1 nVidia Corporation G80 [GeForce 8400 GS]"
Monitor "DELL 1907FP 2"
Defaultdepth 24
SubSection "Display"
Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
Option "AddARGBGLXVisuals" "True"
EndSection

Section "ServerLayout"
Identifier "Default Layout"
screen 0 "Main Screen"
screen 1 "Second Screen" rightof "Main Screen"
Option "TwinView" "true"
Inputdevice "Generic Keyboard"
Inputdevice "Configured Mouse"

[coopstah13]

you need to run nvidia-settings as root as only root can write to xorg.conf by default

[vwfix]

I thought so, but ubunut will not let me log in as root for some reason. or do i just opne a terminal and type in sudo bash
i tried typing in root for log in name and then the root password but that does not work.

[devils casper]

Root login is disabled in Ubuntu. Use sudo to gain root privileges. ( Check here too. )
Execute this

sudo nvidia-settings

[vwfix]

Great I will try that, any help with the xorg.conf file, right now my xwindows is completely screwed but with the settings I posted above, it worked okay, but could not switch the resolution on the second monitor to anything higher then 640.

[devils casper]

Check Refresh rates ( HorizSync/VertRefresh ) of second Monitor. Are those rates supported by Monitor? Check Monitor's manual and edit xorg.conf accordingly.

[vwfix]

Tried that and still nothing, maybe I can add a mode line to force it to use a resolution?

[coopstah13]

nvidia-settings program isn't properly detecting your monitor or anything? All I had to do was use that to set up my dual display, no need for manual configuration of the xorg file that way. What version of ubuntu are you running? what does the command

xrandr

produce?

[devils casper]

Try lower depth.

Section "Screen"
     Identifier "Second Screen"
     Device "1 nVidia Corporation G80 [GeForce 8400 GS]"
     Monitor "DELL 1907FP 2"
     Defaultdepth 16
     SubSection "Display"
        Depth  24
        Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
     EndSubSection
     SubSection "Display"
        Depth  16
         Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
      EndSubSection
     Option "AddARGBGLXVisuals" "True"
EndSection