![]() It is also useful when you have reinstalled Windows on your laptop or tablet. Using the Registry tweak method described above, you can quickly modify the screen brightness settings in your production environment. Repeat these steps for all power schemes you want to modify and you are done.In my case, they are set to 90% and 50% respectively. On the right, modify or create the following 32-bit DWORD valuesĪCSettingIndex - specifies the screen brightness level in decimal from 0 to 100 when plugged in.ĭCSettingIndex for - specifies the screen brightness level in decimal from 0 to 100 when on battery.Tip: If you are getting the following error message "You do not have the requisite permissions to create a new key", run regedit.exe using ExecTI. If you don't have such a key, you need to create it. I did uninstall the update and reboot the PC and the result is i can control the brightness again. Substitute the 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c with the appropriate value you got in the step 3. Before installing the latest update ( March 1, 2019KB4482887 (OS Build 17763.348) ) i normally i can control the brightness of the screen of my PC ( HP Pavilion dv6 notebook pc) but, after installing the updates i cant control it. See how to go to a Registry key with one click. Go to the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes\8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c.For example, the GUID of the High Performance power scheme is 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c. Note the GUID of the power plan for which you want to change the screen brightness.In the output, you'll see GUIDs for each available power plan.Open an elevated command prompt and type or copy-paste the following command: powercfg /L.To change the screen brightness with a registry tweak, do the following. The brightness level can be modified per each power plan. It is possible to change the screen brightness with a Registry tweak. For example, the software brightness settings which directly alter the display's backlight may not work if you have an old CRT monitor. I have gone in and changed my power plan, including changing brightness, but it does not work. Initially everything worked fine, but now the brightness of the screen on battery dims. Also, you may need to update your display drivers. I have a Acer aspire one aod250 that I installed windows 7 32 bit on. ![]() For the method described below to work, you need to have a display with the appropriate hardware support. ![]() Note: While most portable devices like laptops or tablets support changing the brightness of the screen out of the box, most Desktop PCs come without this ability because the display hardware has its own brightness control. How To Change Screen Brightness in Windows 10 I've covered them in the previous article: There are a number of ways to change the screen brightness in Windows 10 without using a Registry tweak.
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