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HDMI outputting only 640×480, with black boarder

AU. Been googling this for 2 days now, trying various fixes which succeeded in only causing an Nvidia persistent error on boot. Although I did manage to increase the resolution at some point, the black border still existed.

PC is connected via hdmi to an LG tv. I had to install using nosetmode as the hdmi signal would drop during the ubuntu splash screen, if that makes a difference.

xrandr fails to get size of gamma, but if it manages to add the higher resolution, it still displays as 640×480 and I only see a corner. This is a fresh install of 18.04.

Some command examples:

    snow-white@snow-white:~$   xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480 default connected primary 640x480+0+0 0mm x 0mm    640x480       73.00*  snow-white@snow-white:~$   sudo lshw -C display [sudo] password for snow-white:    *-display UNCLAIMED               description: VGA compatible controller        product: GT218 [GeForce 8400 GS Rev. 3]        vendor: NVIDIA Corporation        physical id: 0        bus info: pci@0000:01:00.0        version: a2        width: 64 bits        clock: 33MHz        capabilities: pm msi pciexpress vga_controller cap_list        configuration: latency=0        resources: memory:fc000000-fcffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:dc80(size=128) memory:c0000-dffff 

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