1. Introduction

When accessing your Raspberry Pi 4 remotely via a VNC viewer or Teamviewer for the first time it is very likely the screen size shown has a very small resolution (320×200) and hence is unusable. So How to set the Raspberry Pi 4 remote connection screen resolution?

2. Set the remote connection screen resolution

Perform the following steps:

1. Connect to your Raspberry Pi via a SSH connection (for example via Windows by using PuTTY) and login.
2. Execute the following command:
   
   Python

   sudo nano /boot/config.txt

   1	sudo nano /boot/config.txt

   
   This will open the nano file editor with the Raspberry Pi 4 OS configuration file.
3. Find the following 5 lines and if uncomment these if they are commented:
   
   Python

   #framebuffer_width=1280 #framebuffer_height=720 #hdmi_force_hotplug=1 #hdmi_group=1 #hdmi_mode=1

   1 2 3 4 5 6 7

   #framebuffer_width=1280 #framebuffer_height=720   #hdmi_force_hotplug=1   #hdmi_group=1 #hdmi_mode=1

4. Set the framebuffer_width and framebuffer_height to your required resolution
5. Set hdmi_group and hdmi_mode settings to the values shown below:
   
   Python

   hdmi_group=2 hdmi_mode=16

   1 2	hdmi_group=2 hdmi_mode=16

6. Ensure that the following two settings are commented by placing a # in front of them.
   
   Python

   # Enable DRM VC4 V3D driver dtoverlay=vc4-kms-v3d max_framebuffers=2

   1 2 3

   # Enable DRM VC4 V3D driver dtoverlay=vc4-kms-v3d max_framebuffers=2

7. After we complete all the changes, press Ctrl+O to write the changes, and then press Ctrl+X to exit.
8. Reboot the Raspberry Pi 4 by entering the command:
   
   Python

   sudo reboot

   1	sudo reboot

When connected again via VNC viewer or Teamviewer the resolution should be the same as set above.