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You are using xorg multi-head by default. You need to edit the xorg.conf file so it works differently. There are a lot of threads on this sort of thing, like this one. It features ATI cards but the approach is going to be the same as it does not involve driver specific tricks.
Your differences will ba that the driver is nvidia, and your busIDs will be different - you get them off lspci.
# The location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
# Option "AutoRepeat" "500 5"
# when using XQUEUE, comment out the above line, and uncomment the
# following line
# Option "Protocol" "Xqueue"
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option "Xleds" "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:nocaps"
#Option "XkbOptions" ""
Option "XkbRules" "xfree86"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
#Option "XkbVariant" ""
Do you have nvidias own nvidia X server settings software??
I use Ubuntu, and I had problems. But with nvidias software installed, it works ok.
Start nvidia x server settings. Go to the second menu choice at the top: X server display configuration.
Make sure the other monitor is plugged in and on. Click detect displays. The second monitor will appear. It always appears to the right of your monitor. I click the position box and go to absolute, then drag the new monitor over the other one. Then I have two showing the same thing. I've never got it to work as a separate screen, but I only need it to display to class, so that is enough.
As Pedroski mentioned use nvidia-settings to configure your screens the way you like. It will give you the option to write out the xorg.conf file as well. Easiest way to configure nVidia screens the way you like.
Yeah, disabled is default: go to the button configure, you should get a little window, with three choices: disable, separate screen and twinview. Click the check button, close, then click apply. X restarts, and you should have two screens working. It goes funny if you don't put one on top of the other. Position Absolute, then drag it on top of screen 0, your ordinary screen.
You have 15 seconds to accept, or it reverts!
What do you mean you have two cards?? You only need one!
If you leave the new screen at the right, you effectively have a desktop equal to the width of say, mine is 800 plus the other one 768, which is wierd! But then you can drag things off of your screen 0 onto screen 1. A big ol' desktop!
click on screen two, the one on the right, so that it is active. (Has a highlighted frame around it, like the one on the left in your fotos. It must be highlighted to interact with it!
You should then be able to activate twinview.
Works for me!
screen 0 is active at boot, but screen 1 needs to be activated, at least for me. I think it should start of its own accord on boot. Save the X config ( there is a button near the bottom) You may need to be root to do that. I just start up nvidia settings when I want it, and set it up, as the screens I use vary!
Set the resolution to Auto, if you don't know the res of your screens. If they are the same, no problem, but if they aren't you will lose bits of the larger in the smaller!