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Adjust the Resolution

For the Raspberry Pi 3 and the lower versions, you need reset the resolution ratio as follows. As for Raspberry Pi 4, when you start up it, the resolution is optimum. If you want to change its resolution, please refer to the next part.

For Raspberry Pi 3 or Lower Version

Step 1: Open config.txt.

sudo nano /boot/config.txt

Step 2: Modify the /boot/config.txt file.

  1. Define a custom CVT mode (since Raspberry Pi uses the standard rate when 1024x600 is not included, you need to set the aspect ratio close to 16:9) and add the following lines below #hdmi_force_hotplug=1.

hdmi_cvt=1024 600 60 3 0 0 0

hdmi_cvt=<width> <height> <framerate> <aspect> <margins> <interlace>

value

Default

Description

width

(required)

width in pixels

height

(required)

height in pixels

framerate

(required)

framerate in Hz

aspect

3

aspect ratio 1=4:3, 2=14:9, 3=16:9, 4=5:4, 5=16:10, 6=15:9

margins

0

0=margins disabled, 1=margins enabled

interlace

0

0=progressive, 1=interlaced

rb

0

0=normal, 1=reduced blanking

  1. Find the following lines, delete the “#” mark and modify the value like this:

hdmi_group=2
hdmi_mode=87
....
hdmi_drive=2

hdmi_group=2 means DMT (Display Monitor Timings, the standard typically used on monitors) hdmi_mode=87 indicates we create a new hdmi mode named 87. hdmi_drive=2 selects the Normal HDMI mode.

After the modification is done, save and exit. For more details about configuring config.txt, refer to Raspberry Pi official website: https://www.raspberrypi.org/documentation/configuration/config-txt.md.

Step 3: Reboot Raspberry Pi.

Reboot the Raspberry pi with the command sudo reboot.

sudo reboot

For Raspberry Pi 4

  1. Click the Raspberry Pi icon -> Preferences -> Screen Configuration.

../_images/image11.png

  1. Then choose Configure -> Screens -> HDMI-1 -> Resolution -> choose the resolution that you want.

../_images/image121.png

  1. After that you need to click the tick icon to save your configure.

../_images/image13.png