Resolves an issue where the external monitor cannot specify the best resolution under Ubuntu14.04

This is generally the case, and the display on system Settings will find an extra unknown display. This is often because the quality of the video line you use is too poor, such as a few dollars of VGA line. Solution has 2, one is a good quality (with magnetic ring anti-jamming) VGA line or switch to Hdmi,dvi line, two is to write the following bash script to add 1080p display mode:

/home/bruce/bin/set-display.sh

#!/bin/bashxrandr--newmode "1920x1080_60.00" 173.00 1920x1080 2048 2248 2576 1083 1088 1120-hsync +vsyncxrandr--addmode VGA1 "1920x1080_60.00"

Then edit the/etc/profile and add:

# set VGA resolution/home/bruce/bin/set-display.sh

Logoff or restart, problem resolution.

Resolves an issue where the external monitor cannot specify the best resolution under Ubuntu14.04