Software & AppsOperating SystemLinux

How To Change Grub2 Screen Resolution Safely

Ubuntu 7

In this article, we will be discussing a detailed guide on how to safely change the Grub2 screen resolution. Grub2 is the default bootloader for many Linux distributions, including Ubuntu, and it’s essential to understand how to customize it to fit your needs.

Quick Answer

To safely change the Grub2 screen resolution, you need to find your system’s preferred mode, edit the Grub configuration file, and update the Grub settings. It’s a straightforward process that involves accessing the Grub menu, identifying the preferred mode, and making the necessary changes in the configuration file. Remember to back up your data and be cautious when modifying system files.

Understanding Grub2

Grub2 is the second version of the Grand Unified Bootloader (Grub), a boot loader package from the GNU Project. It’s an essential part of any Linux system, responsible for loading the operating system when the computer starts.

Step 1: Finding the Preferred Mode

The first step in changing the Grub2 screen resolution is to find your system’s preferred mode. This mode is the optimal resolution setting for your system.

  1. Restart your computer.
  2. As your computer reboots, press and hold the Shift key to display the Grub menu.
  3. Press C to enter console mode.

Here, you will need to enter a command to display your system’s video information:

  • For Ubuntu versions before 18.04, type $ vbeinfo.
  • For Ubuntu 18.04 and later, type $ videoinfo.

These commands will display a list of supported video modes. Look for the “preferred mode” at the bottom of the output. This will typically be a value like 1280x800 or 1920x1080. Note this value down as you will need it for the next step.

Step 2: Setting the Resolution in Grub

Now that you have your preferred mode, you can proceed to set this as your Grub2 screen resolution.

  1. Open a terminal. You can do this by pressing Ctrl + Alt + T on your keyboard.
  2. Type $ sudo nano /etc/default/grub to open the Grub configuration file in the nano text editor. The sudo command is used to execute the following command with root privileges, while nano is a simple, user-friendly text editor.

In this file, you will need to find and edit the line that says #GRUB_GFXMODE=640x480.

  • Remove the # symbol at the beginning of the line to uncomment it. In configuration files, lines beginning with # are comments and are ignored by the system.
  • Replace 640x480 with the preferred mode you noted down earlier. For example, your line should now look something like GRUB_GFXMODE=1280x800.

Once you’ve made these changes, save the file and exit the text editor. In nano, you can do this by pressing Ctrl + X, then Y to confirm saving changes, and finally Enter to confirm the file name.

  1. Run $ sudo update-grub to update the Grub configuration with your new settings. This command will generate a new Grub configuration file based on your changes.

And that’s it! You’ve successfully changed your Grub2 screen resolution. The next time you boot your computer, Grub should display at your chosen resolution.

Additional Notes

  • The preferred mode should be among those listed by vbeinfo or videoinfo. If your preferred mode is not supported, you may need to experiment with other modes.
  • If you cannot see the output of vbeinfo, you can try using sudo hwinfo --framebuffer to display the same information.
  • In some cases, adding GRUB_GFXPAYLOAD="keep" and GRUB_CMDLINE_LINUX="nomodeset" to the Grub configuration file may be necessary to make the resolution changes stick.
  • For Ubuntu 16.04, the command videoinfo can be used instead of vbeinfo.
  • The Grub Customizer application can also be used to change the screen resolution easily.

We hope this guide has been helpful in showing you how to safely change your Grub2 screen resolution. As always, remember to be careful when making changes to system files and always make sure to back up any important data before making changes. Happy computing!

What is Grub2?

Grub2 is the second version of the Grand Unified Bootloader (Grub), which is a boot loader package from the GNU Project. It is responsible for loading the operating system when the computer starts.

What should I do if my preferred mode is not supported?

If your preferred mode is not supported, you may need to experiment with other modes listed by vbeinfo or videoinfo. You can try different resolutions until you find one that works for your system.

Are there any additional steps I need to take to make the resolution changes stick?

In some cases, adding GRUB_GFXPAYLOAD="keep" and GRUB_CMDLINE_LINUX="nomodeset" to the Grub configuration file may be necessary to make the resolution changes stick. However, these additional steps are not always required and may depend on your specific system configuration.

Is there an alternative way to change the screen resolution in Grub?

Yes, you can use the Grub Customizer application to change the screen resolution easily. It provides a graphical interface for modifying Grub settings, including the screen resolution.

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