===== How to manually set a monitor resolution =====

==== Manual way ====

1. Check present resolution:

   xrandr -q

An example output is:

   VGA1 connected (normal left inverted right x axis y axis)
   1024x768       60.0 
   800x600        60.3     56.2 
   848x480        60.0 
   640x480        59.9 
   DP1 disconnected (normal left inverted right x axis y axis)

2. Generate ‘modeline’ using ‘gtf’ command:

   gtf width height refresh-frequency

Example:

   gtf 1366 768 60

The result is:

   1368x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 85.86 MHz
   Modeline "1368x768_60.00" 85.86 1368 1440 1584 1800 768 769 772 795 -HSync +Vsync

Where is:

  * 1366 - width
  * 768 - height
  * 60 - refresh-frequency

3. Set your resolution copying the last output of **gtf** command, starting after **Modeline**:

   xrandr --newmode "1368x768_60.00" 85.86 1368 1440 1584 1800 768 769 772 795 -HSync +Vsync
   xrandr --addmode VGA1 1368x768_60.00
   xrandr --output VGA1 --mode 1368x768_60.00

It is only temporary solution, after rebooting all the changes will be lost.

----

To make it permanent, do:

1. Create a new file in your home directory, for example **.mymonitor**:

   nano .mymonitor

2. Copy previous 3 commands you used for manually setting the monitor, and paste onto the file: 

   #! /bin/bash
   xrandr --newmode "1368x768_60.00" 85.86 1368 1440 1584 1800 768 769 772 795 -HSync +Vsync
   xrandr --addmode VGA1 1368x768_60.00
   xrandr --output VGA1 --mode 1368x768_60.00

3. Make the file executable:

   chmod +x .mymonitor

4. Add the ~HOME/.mymonitor file to the system startup.

More information about XRandR can be found via commands:

   xrandr --help
   man xrandr

----

==== Randr/XRandr GUIs ====

There are a few frontends for Rand/XRandr, such as:

   * LXrandr

{{:lxrandr.png?300|}}

   * KDE Workspace Randr
   * Arandr 

To install arandr use this command:

    sudo apt-get install arandr


Then open a terminal and enter:

    arandr