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Setup monitor resolution with X11 file

Facing a wrong resolution that is not the correct for you monitor. One option is to set the resolution using xrandr, but xrandr is just for that session. When the computer is rebooted the resolutions will be lost.

There is an easy why to fix that with 10-monitor.conf. Here is a example of the file:

# /etc/X11/xorg.conf.d/10-monitor.conf
# only the Identifier is mandatory

Section "Monitor"
    Identifier     "HDMI1"
    ModelName      "PHILIPS L22W-2"
    Option         "primary" "true"
    Option         "PreferredMode" "1920x1080_60.00"
    HorizSync       31.0 - 83.0
    VertRefresh     56.0 - 75.0
EndSection

You need to change the **identifier**, you can find out the identifier by running this command in you terminal:

xrandr

The output will be something like this

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 530mm x 300mm
   1920x1080     60.00*+  59.94
   1920x1080i    60.00    59.94
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x960      60.00
   1280x720      60.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

In the output the second line has the identifier.

That's it. Now just create the file in **/etc/X11/xorg.conf.d/** make sure to name the file 10-monitor.conf. Then just restart your computer, if everything goes well you will see that the resolution is OK.

Examples

Let's say you have a computer with two video outputs, but you want to use just one of them it will be something like

# /etc/X11/xorg.conf.d/10-monitor.conf
# only the Identifier is mandatory

Section "Monitor"
    Identifier     "HDMI-1"
    ModelName      "PHILIPS L22W-2"
    Option         "primary" "true"
    Option         "PreferredMode" "1920x1080_60.00"
    HorizSync       31.0 - 83.0
    VertRefresh     56.0 - 75.0
EndSection

Section "Monitor"
    Identifier     "eDP-1"
    Option         "ignore" "true"
EndSection

Or can be like

# /etc/X11/xorg.conf.d/10-monitor.conf @ hortensia
# only the Identifier is mandatory

Section "Monitor"
    Identifier     "HDMI1"
    ModelName      "PHILIPS L22W-2"
    Option         "primary" "true"
    Option         "PreferredMode" "1920x1080_60.00"
    HorizSync       31.0 - 83.0
    VertRefresh     56.0 - 75.0
EndSection

Section "Monitor"
    Identifier     "eDP1"
    Option  	   "ignore" "true"
    ModelName      "PHILIPS L22W-2"
    Option         "primary" "false"
    Option         "PreferredMode" "1920x1080"
    HorizSync       31.0 - 83.0
    VertRefresh     56.0 - 75.0
EndSection

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