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If you are having trouble adjusting the brightness or contrast of your laptop display, keep in mind that every model of laptop (and every operating system) is a little different. Common ways to adjust the brightness and contrast on a laptop computer are provided below.

Some of the options on this page work for adjusting brightness or contrast on a desktop computer as well.

Adjusting brightness using your laptop's keys

PC

On most laptops, you can adjust the brightness of the display using special keys on the keyboard. The keys are usually marked with the brightness symbol ().

Often, the brightness keys are function keys which have a special function if you press them while holding down the Fn key.

The Fn key is usually located to the left of your spacebar. The brightness function keys may be located at the top of your keyboard, or on your arrow keys.

For example, on the Dell XPS laptop keyboard (pictured below), hold the Fn key and press F11 or F12 to adjust the brightness of the screen.

Other laptops have keys dedicated entirely to brightness control. On the HP Chromebook keyboard (pictured below), there is no Fn key — press the brightness keys.

Chromebook

To change the brightness on a Chromebook, you'll need to push one of the two adjustment keys. The small gear lowers the brightness, and the large gear raises it. They are located at the top of the keyboard, as you can see in the red rectangle below.

Adjusting brightness in the operating system

You can also adjust your screen's brightness using software controls on your operating system:

Windows 10

In Windows 10, there are several ways to adjust the display brightness.

Using the taskbar's battery icon

1. Click the battery icon on your taskbar.
2. In the power status window, click the brightness tile. Each time you click the tile, your brightness will be adjusted by 25%.

Using the Windows Mobility Center

1. Open the Power User Tasks Menu by right-clicking the Start menu icon, or by typing Win+X (hold down the Windows key and press X).
2. Click Mobility Center (or press B).
3. In the Mobility Center, adjust the brightness slider.

Using the Control Panel

1. Open the Control Panel.
2. Click Adjust commonly used mobility settings.

3. In the Mobility Center window, adjust the brightness slider.

Adjusting brightness in Windows 8

1. Open the Charms bar.
2. Select the Settings charm.
3. Select the brightness icon.
4. Move the slider up and down with your mouse, or by pressing the up and down arrow keys on your keyboard.

Adjusting brightness in Windows 7

1. Open the Control Panel.
2. Select Hardware and Sound.
3. Select Power Options.
4. Use your mouse to move the brightness slider at the bottom of the window.

Adjusting brightness in macOS

1. From the Apple Menu, choose System Preferences..

2. Click Displays.

3. Use the brightness slider to adjust brightness. If you want your brightness to change automatically based on the ambient light near your computer, check the box marked Automatically adjust brightness.

Adjusting brightness in Linux

Many window managers in Linux offer brightness controls in their settings panel. For instance, on Ubuntu systems with the Unity window manager:

1. Click the icon at the right of the menu bar.
2. Choose System Settings.
3. Select Brightness & Lock.
4. Adjust the brightness slider.

If your laptop uses Intel or NVidia graphics, you can also use a convenient command-line tool called xbacklight. It can be installed using most package managers. For instance, on Ubuntu or Debian systems:

To use xbacklight, specify the option -setpercentage, where percentage is a number from 0 to 100. For instance, to set brightness to half:

To set brightness to full:

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You can also increase or decrease the brightness by a percentage. To increase the brightness by 10%:

For a complete list of options, view the manual:

Adjusting contrast

Macos Terminal Admin

Most laptops don't have contrast controls at the hardware level, but you can configure your operating system to use a high-contrast display mode.

Adjusting contrast in Windows 10

1. Hold the Shift and Alt keys on the left side of the keyboard, and press the Print Screen key.
2. Once asked if you want to turn on High Contrast mode. Click Yes.

To switch back to Normal Contrast mode, repeat step 1, and High Contrast mode will be canceled.

If pressing the key combination doesn't bring up the High Contrast prompt, you can enable it in the Ease of Access menu:

1. Open the Control Panel.
2. Click Ease of Access.
3. Select Ease of Access Center.
4. Choose Make the computer easier to see.
5. Make sure that Turn on or off High Contrast when.. is checked.
6. Click OK.

Macos Terminal Command For Display Contrast Examples

Adjusting contrast in Windows 8

1. Open the Charms bar.
2. Click Settings.
3. Select Ease of Access.
4. Under High Contrast, click the button to turn High Contrast mode on or off.

Adjusting contrast in Windows 7

1. Open the Control Panel.
2. In the search bar, type window color.
3. Click Change window color and metrics.
4. Under Basic and high-contrast themes, choose a high-contrast theme.

Adjusting contrast in macOS

1. From the Apple Menu, choose System Preferences...
2. Click Accessibility.
3. Click the Increase Contrast checkbox, and use the Display contrast slider, to adjust your display.

Adjusting contrast in Linux

There are command line tools to adjust the contrast of your screen such as xgamma and xcalib. These can be used to fine-tune any reductions in your screen's default contrast level.

To increase contrast above defaults, most window managers offer a high-contrast theme to make your screen easier to see. In Gnome-based window managers, such as Ubuntu Unity, follow these steps:

1. Open a terminal window.
2. Run the command gnome-control-center to launch the command center window.
3. Click Universal Access.

Macos Terminal Command For Display Contrast Examples

4. Turn on High Contrast.

Controlling screen brightness in your Power Options

After adjusting your laptop's brightness, it should retain the new settings automatically. If the brightness settings are not retained after a computer restart, they are probably being overridden by settings in the Power Options menu. If this is the case, you'll need to create a custom power plan, which can be done by accessing the Power Options utility in the Control Panel.

Driver issues

If the key combination method is not working and you've made the appropriate adjustments in Power Options, it is likely your computer has a video driver problem. Driver issues usually occur after updating the video drivers. Monitor drivers can also cause this problem. To resolve any potential monitor related issues, reinstall the monitor by following the steps below.

1. Click the + or arrow next to Monitors to expand the list.
2. Highlight any detected monitors under Monitors and press delete to remove them from the computer.
3. Once the monitors are removed from Device Manager, under Action, click Scan for Hardware changes to let Windows re-detect the monitor and install the applicable drivers.

Finally, we also recommend downloading the latest video drivers directly from the video card manufacturer. If this problem was caused because you updated the drivers, install an earlier version of the video drivers to see if that resolves the issue.

Laptop brightness is still not enough or screen is black

If, after following the steps above your brightness is still not enough, plug your laptop into the wall. If the laptop is plugged in but still is not bright enough, try the suggestions on the page linked below.

Additional information

• See the brightness, contrast, and laptop definitions for further information.

Terminal User Guide

You can use the command-line environment interactively by typing a command and waiting for a result, or you can use the shell to compose scripts that run without direct interaction.

Execute commands in the shell

• In the Terminal app on your Mac, enter the complete pathname of the tool’s executable file, followed by any needed arguments, then press Return.

If a command is located in one of the shell’s known folders, you can omit path information when entering the command name. The list of known folders is stored in the shell’s PATH environment variable and includes the folders containing most command-line tools.

For example, to run the ls command in the current user’s home folder, enter the following at the command prompt, then press Return:

To run a command in the current user’s home folder, precede it with the folder specifier. For example, to run MyCommandLineProg, use the following:

To open an app, use the open command:

When entering commands, if you get the message command not found, check your spelling. Here’s an example:

Terminate commands

1. In the Terminal app on your Mac, click the Terminal window that is running the command you want to terminate.

2. Press Control-C.

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   This sends a signal that causes most commands to terminate.

Repeat previously entered commands

The commands you enter during a session are saved so you can repeat a previously used command without retyping it.

1. In the Terminal app on your Mac, press the Up Arrow key.

   The last command you entered appears on the command line.

2. Continue pressing the Up Arrow key until you see the command you want, then press Return.