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0e1f616
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Hi,
I have a W520, too, and have exactly the same problems since an LTS->LTS upgrade to 14.04. I now at least have a semi-workaround when starting the display manager with two screens:
Using nvidia-settings, I was able to generate a xorg.conf file that starts with a working two-screen configuration, without panning. File is attached. I guess you'd either need to adjust the values specific to my setup, or try to use nvidia-settings to generate a fresh configuration file. Important hint is to click on 'Advanced...' at the bottom to get the panning configuration.
However, when switching between single- and dual-screen modes, screen panning will reappear and I have not figured out how to solve that yet. Switching to single-screen mode works once, using
xrandr --output LVDS-0 --mode 1600x900 --pos 0x0 --output DP-0 --off --output VGA-0 --off
Hope this helps.