How To Change Resolution on raspberry pi
A Raspberry Pi can often be used with all sorts of displays ranging from tiny portable screens to extra large TVs. Sometimes they are run without a physical screen but have a graphical display that can be accessed remotely through VNC for example. Changing the resolution on a Raspberry Pi is usually easy. This can be done:
- From the GUI
- From a terminal
How do I change screen resolution in Pixel ( Raspbian )
Click on the Raspberry Pi Menu on the taskbar. The exact names for each menu item may be slightly different for different versions of Raspbian.
- Screen Configuration
This will bring up the Screen Layout Editor.
Go to the following:
- Select the resolution you want.
- Click the green check button
- Click OK on the popup
From a terminal
TIP - Hold the shift key during boot. This should restore default settings.
- 7 Advanced Options
- A5 Resolution
- Pick the resolution you want
Using a config file
You are going to need to specify either CEA or DMT for the hdmi_group variable. CEA is usually used for TVs and DMT is usually used for monitors. For the CEA set hdmi_group=1. For the DMT set hdmi_group=2. You will also need to set a resolution mode using the hdmi_mode variable.
sudo nano /boot/config.txt
Here is an example showing how to set a monitor (DMT) to 1920×1080, 16:9, 60hz:
Here is an example showing how to set a TV (CEA) to 1920×1080, 16:9, 60hz:
See this document for more details on using the config.txt file for video settings. It has a table with values that can be used for the hdmi_group varialbe.
Once you have your settings in place, reboot the system:
How do I change resolution on Retropie?
If you are using Retropie you can use a process similar to what we listed above to setup /boot/config.txt. You will probably want to fiddle around with a lot of other options though. There is a much better write up for this here in the official Retropi docs.