Nouveau dual monitor resolution fix

 

NOTE! This has been written to ensure compatibility with arandr!

1. Install arandr
sudo apt-get install arandr

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2. Run xrandr
If your chosen resolution exists (regardless of which monitor it appears by) then skip the next step

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3. If your resolution does not exist, create it by doing the following:
In this example the resolution I want is 1280x1024
cvt 1280 1024

This will create a modeline like this:
"1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027 1034 1063 -hsync +vsync

Create the new mode:
xrandr --newmode "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027 1034 1063 -hsync +vsync

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4. Add the mode (resolution) to the desired monitor (VGA-1):
xrandr --addmode VGA-1 "1280x1024_60.00"

5. Run arandr and position your monitors correctly

6. Choose 'layout' then 'save as' to save the script

7. I found the best place to load the script (under Xubuntu) is the settings manager:
xfce4-settings-manager

OR

Menu -> Settings -> Settings Manager -> Session and Startup -> Application Autostart