I've installed Ubuntu 16.04.1 minimal and Kodi 16 (Jarvis) onto 64-bit AMD mobo with a Radeon HD 5000/6000/7350/8350 Series video card using these instructions

I setup kodi to autostart using a nopassword user kodi using these instructions. Everything went well and Kodi runs beautifully displaying on my 50" Panasonic Viera plasma, which is connected to the Radeon card via HDMI.

My problem is the boot/terminal screen resolution, which is way overscanned, to the extent that the screen is extended about 10 columns too far left of the visible screen. IOW, in a terminal window, I cannot see the $ prompt or any text to the left of roughly 12-14 characters.

I can SSH into the server easily and I've tried to use xrandr (as root and with sudo), but I can only get Can't open display. When I try to change to the user kodi to run xrandr, I'm asked for a password and the system will not accept the blank password (user kodi has no password).

I'm sure I need to adjust the default screen resolution to something along the lines of 1280x720, but I cannot do so. I've read some solutions that suggest a grub config edit, but I'm not sure this is how I need to go.

I've also looked at the X instructions here but I have no xorg.conf file and I cannot get xrandr to show me anything except Can't open display. I can do anything I need to do via SSH, but I'd like to be able to see a terminal screen on the TV display when necessary.

Thanks for any tips!

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