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I'm running Xubuntu 14.04 with a Nvidia GT 640 (OEM Dell w/GDDR5) video card. When I use the open source driver the display detects as Dell 18" which is correct, as it is a Dell P96 Trinitron display. I have all of the correct resolutions and refresh rates available. The xrandr output is as follows.

    jean@jean-G41M-Combo:~$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
DVI-I-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 352mm x 264mm
   1024x768       85.0*+   75.1     70.1     60.0  
   1600x1200      85.0     75.0     70.0     65.0     60.0  
   1400x1050      85.0     74.9     60.0  
   1600x900       60.0  
   1280x1024      85.0     75.0     60.0  
   1440x900       84.8     75.0     59.9  
   1280x960       85.0     60.0  
   1366x768       60.0  
   1360x768       60.0  
   1280x800       84.9     74.9     59.8  
   1152x864       75.0  
   1280x768       84.8     74.9     59.9  
   1024x768i      87.1  
   1024x576       60.0  
   800x600        85.1     72.2     75.0     60.3     56.2  
   848x480        60.0  
   640x480        85.0     75.0     72.8     60.0  
   720x400        85.0     70.1  
   640x400        85.1  
   640x350        85.1  
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)

When I install the Nvidia proprietary driver to gain some of the features that come with it (such as power management of the card, 3 states) I loose all but a handful of resolutions and only have 60hz refresh rates in the Nvidia control panel, the Xubuntu display configuration panel, and the xrandr output also only lists what I can see in the control panels.

Why is this and how do I correct it so that the display has all of the correct modes available with the Nvidia 331 driver? I'm giving this computer to someone and I need it to 'just work' when they connect it to their own monitor and accessories since I can't give them any on site help. If it makes any difference my testing monitor is connected via a DVI to VGA, but I don't think that would cause an issue. I really appreciate some help with this, I've been going at it for 2 days and haven't had any luck. Please ask if you need more details.

So far I've managed to break the display once and then repair it from only 640x480 at 59hz, I've removed the Nvidia drivers and deleted the conf files it had created to try to put it all back to a clean slate.

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