How to Change Screen Resolution and Refresh Rate in Ubuntu Displays Settings

Connecting a modern high-resolution monitor, ultrawide screen, or gaming display to an Ubuntu desktop often requires configuring your display settings to unlock optimal visual clarity. If your desktop looks unusually blurry, stretched, or choppy, the operating system may have defaulted to a conservative baseline resolution or a sluggish 30Hz or 60Hz refresh rate. Fine-tuning your display settings in Ubuntu ensures crisp text rendering and fluid animations.

Why Screen Resolution and Refresh Rate Matter

Setting your display parameters correctly maximizes visual comfort and hardware performance:

• Native Sharpness: Matching Ubuntu’s output resolution to your monitor’s native pixel count (such as 1920×1080 Full HD, 2560×1440 2K, or 3840×2160 4K) eliminates blurry scaling artifacts.
• Fluid Motion (Hz): Increasing the refresh rate to 120Hz, 144Hz, or 165Hz on supported displays drastically reduces motion blur, makes cursor movement silkier, and relieves eye fatigue.
• Multi-Monitor Alignment: Adjusting individual display orientations and resolutions prevents mouse cursor snags when moving across mixed-monitor setups.

How to Change Resolution and Refresh Rate via Settings

The standard GNOME desktop environment in Ubuntu offers comprehensive display management controls.

1. Click the Quick Settings menu in the top-right corner of the top bar and click the Settings gear icon.
2. In the left sidebar of the Settings window, click on Displays.
3. If you have multiple monitors connected, click on the rectangle representing the specific display you wish to configure at the top of the panel.
4. Click the Resolution dropdown menu and select your monitor’s native resolution (often marked with the monitor’s native aspect ratio, such as 16:9).
5. Click the Refresh Rate dropdown menu and select the highest supported frequency (e.g., 144.00 Hz or 60.00 Hz).
6. Click the green Apply button in the top-right corner of the window.
7. A confirmation prompt will appear displaying a 20-second countdown. If your screen looks clear and normal, click Keep Changes. If the screen remains black or flickers, let the timer run out to revert automatically.

How to Adjust Fractional Scaling for High-DPI Displays

If selecting your monitor’s native 4K resolution makes desktop icons and browser text too microscopic to read comfortably, you can scale the interface without sacrificing sharpness:

1. In the same Displays settings window, locate the Fractional Scaling toggle switch.
2. Toggle the switch to ON.
3. Additional scaling percentages (such as 125%, 150%, and 175%) will become available alongside standard 100% and 200% steps.
4. Select your preferred scale and click Apply to achieve comfortable text readability.

Checking Display Configuration via Terminal (xrandr)

If you are troubleshooting display modes on an X11 session or need to script monitor profiles, you can query your active video outputs using xrandr:

1. Open Terminal (Ctrl + Alt + T).
2. Run xrandr --query to view connected video ports (e.g., HDMI-1 or DP-1) and all supported resolution modes and refresh rates.
3. To switch modes instantly via CLI, run:

   xrandr --output HDMI-1 --mode 1920x1080 --rate 144