How To Change External Monitor Screen Resolution In Ubuntu

Do you have problem that your laptop external monitor resolution are not detected in Ubuntu?

Don't worry there is a solution, and it is and easy one.

Change resolution on external monitor require editing xorg.conf file.

First make backup of xorg.conf

To do this go to Terminal and type:

sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf-backup

Then type:

sudo gedit /etc/X11/xorg.conf

Then paste this

Section "Monitor"
Identifier "External Monitor"
Option "DPMS"
HorizSync 62.0 - 72.0
VertRefresh 55.0 - 65.0
Modeline "1920x1080" 176.92 1920 2008 2224 2632 1080 1080 1083 1120 +hsync +vsync
EndSection
Section "Screen"
Identifier "External Screen"
Monitor "External Monitor"
DefaultDepth 24
Option "metamodes" "1920x1080 176.92 1920 2008 2224 2632 1080 1080 1083 1120"
SubSection "Display"
Depth 24
Modes "1920x1080_60.00"
EndSubSection
EndSection

You need to edit text in yellow, to get this information you need get modeline for your monitor.

You can use XFree86 Modeline Generator.
I was using this modeline generator, but it seams there is no modeline generator on link anymore.

If something goes wrong you can any time use backup of xorg.conf

sudo cp /etc/X11/xorg.conf-backup /etc/X11/xorg.conf