Start with the simple checks. Change one thing at a time so you can tell which step helped.
Brightness may be reduced by the keyboard, battery saver, adaptive brightness or the display itself. First, note what changed recently and whether the same issue affects another device. This helps separate a device-specific fault from a wider network or service issue.
Troubleshooting steps
Check the basics
Use the laptop’s brightness keys and Windows display settings to set a comfortable level. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Review the settings
Connect power and check whether battery saver changes the screen behavior. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Test one change
Review any adaptive brightness or content-based brightness option supported by the laptop. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Confirm the result
Restart after installing display updates from Windows Update or the manufacturer. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Helpful note
If the screen flickers or stays dim at every setting, seek hardware support rather than opening the laptop.
When to get more help
If these checks do not resolve the issue, contact the relevant device maker, internet provider or app support team. Include the exact model, software version, any error message, what you have already tried and when the problem began. Avoid sharing passwords, verification codes or private account details in a public forum.
For equipment that is hot, damaged, wet or making unusual electrical sounds, stop using it and seek qualified support. Do not open power supplies, batteries or mains-powered equipment.
Settings and menu names vary by model and software version. Use the manufacturer's current instructions for device-specific steps, and back up important files before making changes that could remove data.