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Substitute the 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c with the appropriate value you got in the step 3. 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. Also, you may need to update your display drivers. 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: Unfortunately, if there’s no physical adjustment control, no secondary keyboard control, and no software control for brightness, then I’m not aware of a way to adjust it.There are a number of ways to change the screen brightness in Windows 10 without using a Registry tweak. You might also like to turn off the “Adjust my screen brightness automatically” option if you find that the brightness is changing in ways that don’t work for you. If it is present and enabled, then naturally, you can adjust the brightness as you like. Not all displays allow for their brightness levels to be adjusted using software. It may not be there, or it may not be enabled. On the resulting page, there may be something called Adjust brightness or Brightness level.In the left-hand column, choose Display.Right-click on the desktop and choose Personalize.If you have the correct drivers (in other words, if your video-card drivers support this), it’s sometimes possible to adjust the brightness in Windows itself. Regardless, you’ll need to hold down another key, often a “Fn” key, to use the secondary functions. The secondary functions are occasionally printed in a different color, such as blue. In most cases, these “secondary functions” use the same keys as other functions, like the up/down arrows pictured above. Use in conjunction with “Fn” or other modifier key to adjust brightness. An example of brightness-adjustment keys. The exact sequence varies based on what laptop you have. Instead, there may be a key sequence that can change the brightness for you. If you’re using a laptop, you or may not have actual physical controls. Push buttons that let you increase or decrease the brightness as you see fit.Actual, physical knobs that can be turned one way or the other to adjust the brightness.On a traditional desktop machine with a separate monitor, brightness is often a control on the monitor itself.Ĭonsult the documentation for your specific model, of course, 1 but the controls are generally either of two styles: Though, of course, that’s changing as well. Brightness, along with a few other settings, is typically adjusted elsewhere. Well, to be blunt … more often than not, you don’t.Īt least, you don’t adjust it in Windows.