I upgraded from 12.04 to 13.10, and after that, my secondary monitor doesn't work anymore.

A little more info:

$ xrandr -q

xrandr: Failed to get size of gamma for output default

Screen 0: minimum 640 x 480, current 1280 x 1024, maximum 1280 x 1024

default connected 1280x1024+0+0 0mm x 0mm

   1280x1024       0.0* 

   1024x768        0.0  

   800x600         0.0  

   640x480         0.0  



$ lspci | grep VGA

01:00.0 VGA compatible controller: NVIDIA Corporation GF114 [GeForce GTX 560 Ti] (rev a1)



$ sudo lshw -C video

  *-display UNCLAIMED     

       description: VGA compatible controller

       product: GF114 [GeForce GTX 560 Ti]

       vendor: NVIDIA Corporation

       physical id: 0

       bus info: pci@0000:01:00.0

       version: a1

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress vga_controller bus_master cap_list

       configuration: latency=0

       resources: memory:f4000000-f5ffffff memory:e8000000-efffffff memory:f0000000-f3ffffff ioport:e000(size=128) memory:f6000000-f607ffff

Even at login screen, it doesn't detect it at all.

So, anyone knows how to fix this?