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How to Fix a Monitor that Keeps Changing Brightness (STEPS)

Why does my monitor keep changing brightness?

The main reasons why a monitor keeps changing brightness is because of adaptive brightness settings, unsteady power, incorrect screen resolution or a outdated graphic drivers.

  • Adaptive Brightness
  • Software Problem
  • Unsteady Power
  • Screen Resolution
  • Hardware Problem


Adaptive Brightness

The most probable reason for the Windows monitors changing brightness is adaptive brightness. Most monitors come with an ambient light sensor, which adjusts the screen brightness based on the ambient lighting. That is why the screen may look dull in a dark ambiance and bright in an illuminated ambiance such as a sunny day.

The adaptive brightness feature is available in Windows 10, 11 and some earlier operating systems. If this feature is on, the brightness changes automatically without any manual configuration. However, you can turn this feature OFF if it bothers you.


Software Problem

Software problems such as outdated graphics drivers can be the reason for the too dark or bright screen. This reason is not as common as adaptive brightness or hardware problems. However, if you notice this problem, you need to update your software driver to fix the issue.


Unsteady Power

Some system components in your desktop or laptop might be unable to receive the amount of power they need to function properly. This can lead to a dim or bright screen in your device. You can fix this problem with a power troubleshooter.

Another common problem is unsteady power that can lead to a dim screen on your laptop or desktop.

If unsteady power is triggering a power plan change, your screen may look darker than usual. The source of power, usually a DC or battery, is the root of this problem, which you need to check and fix.


Screen Resolution

Every display has a specific level of screen resolution to give users the best visual experience.


An incorrect display resolution can cause a computer screen to be too bright or dark.


Also, various types of software, apps or the operating system itself are trying to function with the set resolution, which can lead to this issue.

Hardware Problem

A loose or damaged hardware in your laptop or desktop may lead to a sudden change of brightness. This is the most unfortunate reason because a hardware problem means you may have to invest more time and money to fix it.


Why does my screen brightness keeps changing windows 10?

Devices equipped with Windows 10 operating system may experience the screen brightness changing problem due to adaptive brightness, wrong display resolution, hardware issues or software issues.


Monitor brightness keeps changing


How do I stop Windows 10 from dimming the screen?

To stop Windows 10 from dimming the screen, you can try changing the adaptive brightness, updating graphics drivers, checking the power supply, running a power troubleshooter, setting the display resolution and solving hardware issues.

Change Adaptive Brightness

You can change the adaptive brightness mode on your Windows 10 desktop to solve the low brightness issue.

  • Open the Control Panel of your laptop/desktop.
  • Click on the Hardware and Sound
  • Select Power Options and then click on the Change plan settings
  • Click on the Change advanced power settings
  • Expand Display and under it, expand Enable adaptive brightness.
  • Turn OFF the Plugged-in and Battery
  • Click OK and your brightness issue will be solved.


Update Graphics Drivers:

If the above method doesn’t work, you need to go for a graphics drivers update.

  • Open the Device Manager of your laptop/desktop.
  • Expand Display adapters to highlight the onboard graphics card.
  • Right-click on the card name and click on the Update driver
  • Search online for updated version of the driver and install it.
  • Repeat the above method for your GPU chip and restart your system.


Check Power Supply

As I’ve mentioned above, unsteady power can lead to a low brightness on Windows 10. Here are the things that you need to check:

  • Ensure that your system is plugged in securely.
  • Check whether the current is fluctuating. If so, you need to use a current stabilizer.
  • If your system is connected via an extension board, you need to check for wire damages.
  • Check whether the extension board is overloaded or has electric surges.
  • Remove all the power-hungry devices connected to the extension board.


Power Troubleshooter

Your Windows 10 system comes with a power troubleshooter that can detect the problem. Here is how you can use it:

  • Open the Control Panel of your device.
  • Using the top right dropdown, click on Small Icons view.
  • Click on the Troubleshooting menu followed by the View All option in the left pane.
  • Click the Power button to run the troubleshooter.
  • Do all the fixes recommended and restart your system.


Setting Display Resolution

If your screen resolution is lower than the required resolution, you can change it to solve the brightness issue. Here are the steps to follow:

  • Open Settings (Keyboard shortcut: Win+I) and go to System.
  • Click on the Display menu and select the recommended display resolution. .
  • Restart your system to see the changes.


Solve Hardware Issues

To solve hardware issues, you need to open your system and check whether the graphics card, power supply unit and battery are loose or damaged. If they are loose, you can easily reconnect them on your own. If they are damaged, you may need to consult the customer care team of your system.


Why does my screen brightness keep changing windows 11?

If your system has the latest Windows 11 operating system, the brightness may keep changing due to multiple reasons such as an ambient light sensor, low battery, unstable current or software and hardware issues.

  • Ambient Light Sensor: Windows 11 has an ambient light sensor, a software in smart devices that detects ambiance light and accordingly increases or lowers the display brightness. Though this feature aims to uplift the user experience, it often turns out to be a poor experience for the users.
  • Low Battery: If your laptop’s battery drains and the indicator also shows you that you need to plug the charger, the display brightness may automatically dim. This feature helps you to extend the battery life of your device.
  • Unstable Current: Sometimes poor connectivity to the electric source results in display brightness change. The display may either become low or fluctuate if the ports are not connected properly. Also, charging multiple devices via one extension cord may result in brightness change.
  • Software and Hardware Issues: If some software of the device is outdated or some hardware components are damaged, that can result in a change of display brightness.


How do I stop Windows 11 from dimming the screen?

To stop Windows 11 from dimming the screen, you can try turning the adaptive brightness OFF, brightening the screen manually and looking for software and hardware fix.

Turn Adaptive Brightness OFF

You need to turn the adaptive brightness feature OFF to stop your Windows 11 monitor from dimming. Here’s the correct method of doing it:

  • Go to Control Panel and click on the Hardware and Sound.
  • Select Power Options and click on the Change plan settings
  • Click on the Change advanced settings
  • Expand Display and turn the Adaptive Brightness OFF for both Plugged-in and battery
  • Click OK..


Brighten the Screen Manually

After turning OFF the adaptive brightness on your device, you can manually increase the brightness if the screen is too dim. Here’s the method of doing it:

  • Go to Settings or press Win+I and then click on System.
  • Click on Display and scroll down to the Display Resolution
  • Use the dropdown list to select the resolution that is recommended for the system.
  • Reboot your system to make it function properly.


Software and Hardware Fix

There are multiple software and hardware components in your system that needs an update. Here are some solutions:

  • Go to Device Manager and expand Display adapters.
  • Do a right-click on the onboard graphics card.
  • Click on the Update driver
  • Search online for updated versions of the driver and install the latest version.
  • Always restart your system after an update.

If it’s a hardware issue, you need to check whether all components such as battery, graphics card, and power supply unit are working properly. If the issue still prevails, calling the customer support of your laptop or desktop brand will be the best idea.

Why is my laptop suddenly brightening and dimming?

If your laptop is suddenly brightening and dimming, it may be because the adaptive brightness is ON or the laptop is giving a low battery indication..

  • Adaptive Brightness is ON: If the Adaptive Brightness mode is ON, your monitor will suddenly brighten and dim because of the ambient light sensor. This feature sets your monitor brightness depending upon the current ambient light. If the ambient light is low, the display will brighten and if it’s bright, the display will dim automatically.
  • Low Battery Indication: If the battery of the system drains below a certain level, the battery indicator notifies you to plug in the charger. Usually, the display dims automatically with this notification. You can turn this feature OFF if it seems annoying to you.


How to turn OFF adaptive brightness windows 10?

Here’s how you can turn OFF adaptive brightness in Windows 10:

  • Go to Control Panel followed by Hardware and Sound.
  • Click Power Options and then Change plan settings.
  • Click the Change advanced settings
  • Expand Display and turn OFF the adaptive brightness for both Plugged-in as well as battery status
  • Click OK.


How to turn OFF adaptive brightness windows 11?

Follow the steps below to turn OFF adaptive brightness in Windows 11:

  • Go to Control Panel>Hardware and Sound.
  • Select Power Options>Change plan settings>Change advanced plan settings.
  • Expand Display and turn adaptive brightness OFF.
  • Click OK.


Why can’t I change the brightness on my monitor?

Your system may have outdated driver software, which is probably not making the brightness control work. This is why you are unable to change the brightness on your monitor.

You need to update the driver software to solve this issue. Here is the right method of doing it:

  • Go to Device Manager and expand Display adapters.
  • Find the onboard graphics card option and right-click on it.
  • Click on Update driver, search online for updated versions and install the most recent version.
  • Restart your system and the issue will be resolved.


Samsung monitor changes brightness by itself

If your Samsung monitor changes the brightness by itself, don’t be upset as you can fix this issue quickly once you have the technical know-how. The reasons could be adaptive brightness, power supply issues or battery issues.

Adaptive Brightness:

This feature makes your display brightness automatically change as the ambiance light changes.

New laptop models such as the Galaxy Book Pro 360 5G, Galaxy Book Odyssey and Galaxy Book have the latest Windows 11 OS and the brightness change issue.

However, you can turn it OFF by following the methods below:

  • Go to Control Panel>Hardware and Sound>Power Options>Change plan settings.
  • Click Change advanced plan settings and expand Display,
  • Turn the adaptive brightness feature OFF and click OK.
  • Restart your system.


Power Supply Issues:

If your Samsung laptop or desktop is having any power supply issues, it can change or fluctuate the brightness. You need to check if your system is plugged incorrectly. Also, check whether there are too many devices connected to the extension board.


Battery Issues:

If your Samsung laptop has a low battery, the brightness can suddenly decrease. You need to charge your laptop battery immediately to brighten the screen. If it doesn’t fix the issue, you may have to replace the laptop battery with a new one.


HP monitor changes brightness by itself

HP models such as 15s-fr2508TU, 15s-fq2626TU, 14s-fq1089AU and more have Windows 11 operating system.

If your HP monitor changes the brightness by itself, it could be due to ambient light sensor or poor battery.

  • Ambient Light Sensor: Your HP monitor with Windows 11, 10, or even 8 and 7 may have this feature, which makes the screen go darker and brighter as the ambiance light shifts from dark to bright.
  • Poor Battery: If the battery is too low, it can make the monitor darker until you plug in the charger. If the battery is damaged, you need to replace it with a new one.

Ernie Lo

Ernie Lo is a qualified web designer and web developer. He works as an IT support technician and website manager at Benleigh Vending, and he also fixes vending machines.

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