Introduction

In this guide, I have provide workaround for screen resolution issue. Hopefully this workaround should work in all Ubuntu.

Note: I have tested only for Intel Graphics Controller.

1. Go to System ---> Preferences ---> Display

menu.png

2. You will see a screen similar to the following, where you can change refresh rate, resolution, rotation and detecting monitors.

display preferences.png

  • In this screen as you see monitor will not get detected and you will not have options to change refresh rate, resolution and rotation.

Workaround

1. To know what is your controller open a terminal and execute the following command :

$ sudo lspci | grep -i vga

It should give message like this:

$ sudo lspci | grep -i vga
  00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics
  Controller (rev 0c) 

2. Make sure that your hardware is not in the blacklist. Modify the script /usr/bin/compiz. Open a terminal and execute the following command :

$ sudo gedit /usr/bin/compiz

Search in the file the lines about the blacklist. There should be a pair of lines with your (i.e. intel) graphic card. Comment them out (meaning: put a '#' at the beginning of the line).

It should look like this:

# blacklist based on the pci ids 
# See http://wiki.compiz-fusion.org/Hardware/Blacklist for details 
#T="   1002:5954 1002:5854 1002:5955" # ati rs480 
#T="$T 1002:4153" # ATI Rv350 
#T="$T 8086:2982 8086:2992 8086:29a2 8086:2a02 8086:2a12"  # intel 965 
#T="$T 8086:2a02 " # Intel GM965 
#T="$T 8086:3577 8086:2562 " # Intel 830MG, 845G (LP: #259385) 
BLACKLIST_PCIIDS="$T" 
unset T

3. In xorg.conf, replace "vesa" with "intel". Open a terminal and execute the following command :

Note: Make sure you take a backup of xorg.conf before editing.

$ sudo gedit /etc/X11/xorg.conf
  • Search for “vesa” and replace it with “intel”.
  • Save and close the file.

4. Restart the computer and now you can change refresh rate, resolution, rotation and detecting monitors.

Unable to change Screen resolution in Ubuntu (last edited 2010-05-05 17:12:15 by david-dbooth)