Fix Can’t adjust screen brightness in Windows 10

Fix Can’t adjust screen brightness in Windows 10: If you have recently upgraded to Windows 10 then you may be facing this annoying issue where you can’t adjust the screen brightness, in short, screen brightness settings stopped working. If you try to adjust the brightness using Windows Settings apps, you won’t be able to change anything, as dragging the brightness level up or down will do nothing. Now if you try to adjust brightness using the brightness keys on the keyword then it would display the brightness level going up and down, but nothing would actually happen.

Why I am unable to adjust screen brightness on Windows 10?

If you have enabled automatic battery management then if the battery starts to become low the brightness will be automatically changed to dim settings. And you won’t be able to adjust the brightness again until you will change the battery management settings or charge your laptop. But the issue can be a number of different things for example corrupted drivers, incorrect battery configuration, ATI bug等等。

This is quite a common issue which a lot of Windows 10 users are facing right now. This issue can also be caused because of the corrupt or incompatible display driver and thankfully this issue can be easily resolved. So without wasting any more time let’s see how to actually fix can’t adjust screen brightness in Windows 10 with the help of below-listed steps.

Fix Can’t Adjust Screen Brightness in Windows 10

確保建立一個還原點，以防出現問題。

方法 1：更新顯示適配器驅動程序

1. 按 Windows 鍵 + R 然後輸入 鍵入devmgmt.msc 然後按Enter打開 裝置經理。

2. 展開 顯示適配器 and then right-click on the integrated graphics card and select 更新驅動程序

注意： The integrated graphics card would be something like 英特爾高清顯卡4000。

3。 然後點擊 自動搜索更新的驅動程序軟件 and let it install the driver automatically.

注意： Make sure you have a good internet connection in order for Windows to automatically download the latest drivers.

4. Reboot your PC and see if the issue is resolved or not.

5. If not then again select 更新驅動程序 and this time click on 瀏覽我的電腦以獲取驅動軟件。

6。 接下來，單擊 讓我從計算機上的可用驅動程序列表中選擇 底部的選項。

7。 現在 複選標記 “顯示兼容的硬件” then from the list select Microsoft Basic顯示適配器 並點擊 下一步。

8. Let it install the basic Microsoft display driver and reboot your PC to save changes.

Method 2: Adjust the brightness from Graphics Settings

1. Right-click in an empty area on the desktop then select 英特爾圖形設置。

2。 現在點擊 顯示屏 from the Intel HD Graphics Control Panel.

3. 從左側菜單中，選擇 Color Settings.

4. Adjust the Brightness slider according to your liking and once done, click 應用。

方法3： Adjust screen brightness using Power Options

1.右鍵單擊 電源圖標 在任務欄上選擇 電源選項。

2.現在點擊 更改計劃設置 next to currently active power plan.

3。 點擊 更改高級電源設置 在底部。

4. From the Advanced settings window, find and expand 顯示。

5. Now locate and click each of the following to expand their respective settings:

顯示亮度
顯示屏亮度暗淡
啟用自適應亮度

5. Change each of these to the settings you wish, but make sure “啟用自適應亮度”是 關掉。 

6. 完成後，按一下“應用”，然後按一下“確定”。

7. 重新啟動您的 PC 以保存更改。

方法 4：啟用通用 PnP 監視器

1. 按 Windows 鍵 + R 然後輸入 鍵入devmgmt.msc 並按 Enter 打開設備管理器。

2. 展開 顯示器 然後右鍵單擊 通用PnP監視器 並選擇 啟用。

3. 重新啟動您的電腦以儲存變更並查看是否能夠 fix can’t adjust screen brightness in Windows 10 issue.

方法 5：更新通用 PnP 監視器驅動程序

1. 按 Windows 鍵 + R 然後輸入 鍵入devmgmt.msc 並按Enter鍵。

2. 展開 顯示器 然後右鍵單擊 通用PnP監視器 並選擇 更新驅動程序

3。 選擇 瀏覽我的電腦以獲取驅動軟件。

4。 接下來，單擊 讓我從計算機上的可用驅動程序列表中選擇 底部的選項。

5.現在選擇 通用PnP監視器 然後單擊下一步。

6. 重新啟動您的電腦以儲存變更並查看是否能夠 fix unable to adjust screen brightness on Windows 10 issue.

方法一：更新顯示卡驅動

If the Nvidia Graphics drivers are corrupted, outdated or incompatible then you won’t be able to adjust screen brightness in Windows 10. When you update Windows or install a third-party app then it can corrupt the video drivers of your system. In order to resolve this issue, you need to update your graphics card drivers in order to fix the underlying cause. If you face any such issues then you can easily update graphics card drivers with the help of this guide.

Method 7: Delete hidden devices under PnP Monitors

1. 按 Windows 鍵 + R 然後輸入 鍵入devmgmt.msc 並按Enter鍵。

2. Now from Device Manager menu click 查看 > 顯示隱藏的設備。

3. Right-click on each of the hidden devices listed under 顯示器 並選擇 卸載 設備。

4. 重新啟動您的電腦以儲存變更並查看是否能夠 adjust screen brightness in Windows 10.

方法 8：註冊表修復

注意： This method is only for users who have ATI graphics card and have Catalyst installed.

1. 按 Windows 鍵 + R 然後輸入 註冊表編輯器 並按 Enter 打開註冊表編輯器。

2. 導覽至以下註冊表​​項：

HKEY_LOCAL_MACHINE  SYSTEM  ControlSet001  ControlClass  {4d36e968-e325-11ce-bfc1-08002be10318}  0000

3. Now double-click on the following Registry keys and set their value to 0 then click OK:

MD_EnableBrightnesslf2
KMD_EnableBrightnessInterface2

4. Next, navigate to the following key:

HKEY_LOCAL_MACHINE  SYSTEM  CurrentControlSet  Control  Class {4d36e968-e325-11ce-bfc1-08002be10318}  0001

5. Again double-click on MD_EnableBrightnesslf2 and KMD_EnableBrightnessInterface2 then set their value’s to 0.

6. Close everything and restart your PC to save changes.

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我希望上述步驟對您有所幫助，並且您能夠 fix Can’t Adjust Screen Brightness in Windows 10 but if you still have any questions regarding this post feel free to ask them in the comment section.