I have a similar issue with a 2nd monitor on my system that refuses to 
come up in its (native) 1280x1024 mode and will come up as 1024x768 -- 
the system utility for setting the display resolution doesn't list 
1280x1024 as valid for this monitor.

I wrote a script to force this that I run once when I reboot -- I used 
to include it in a system start up script (/etc/gdm/Init/Default), but 
Fedora 20 has moved stuff around and I haven't found the right place to 
include it...
--------------------------------------
# cat set_vga0.sh
#!/bin/bash
#
if [ $( id -u ) -ne 0 ]; then
   echo "This has to be run as root"
   exit 1
fi
#
xrandr --newmode "1280x1024_60.00"  109.00  1280 1368 1496 1712 1024 
1027 1034 1063 -hsync +vsync
xrandr --addmode VGA-0 1280x1024_60.00
xrandr --output VGA-0 --mode 1280x1024_60.00
-------------------------------------------------------------------

I got the parameters for the 1st xrandr command by running:
cvt 1280 1024

The 2nd xrandr command adds 1280x1024 to the list of valid screen 
resolutions for VGA-0
The 3rd one actually sets it into effect.

Disclaimer -- these are dangerous commands!  Don't use them unless you 
KNOW that your monitor can support the resolution to which you're 
setting it!  I understand bad things (blown hardware) can happen if you 
ignore this.

Hope that helps,

Richard Wilson
-------------------------------------------------------
On 01/12/2015 11:48 AM, joe@actionline.com wrote:
> On my new Dell laptop with Linux Mint, the display does not fill the
> available screen space. There is a 1/4" black band on both sides, top and
> bottom.
>
> How can I correct this?
>
> System settings > Display and monitor ... does not provide any options
> for setting display resolution or changing the size of the display
> window.
>
>
>
>
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