To find out if your PC supports this, select Settings > System > Display. Some PCs can let Windows automatically adjust screen brightness based on the current lighting conditions. (If the slider isn't there, see the Notes section below.) Select action center on the right side of the taskbar, and then move the Brightness slider to adjust the brightness. For more info, see Adaptive brightness and contrast in Windows. Some Windows PCs can automatically adjust the screen brightness and contrast based on content that’s displayed on your built-in screen. You might also see another check box displayed: Help improve battery by optimizing the content shown and brightness. Even if you use it, you can still move the Brightness slider to fine-tune the brightness level for a built-in display. This automatic setting helps make sure your screen is readable wherever you go. Select Brightness, look for the Change brightness automatically when lighting changes check box, and then select it to use this feature. To find out if your PC supports this, select Settings > System > Display. (If the slider isn't there, see the Notes section below.) I was finding this for a very long time and the other answer didn't work for me, but I was finally able to figure this hack out, and hopes this helps many other people.Select the Network icon on the right side of the taskbar, and then move the Brightness slider to adjust the brightness. And then remove that custom value from dconf-edtor for volume-up (or set it back to its previous value). So we manipulate the value for volume from settings and then use that value for screen-brightness-up in the dconf editor. We have to do this as we can access the shortcuts for volume and not for brightness. Then head over to dconf editor and search for volume-up, and now see the string in the custom value for volume-up, and now copy paste this string to the screen-brightness-up > custom value field. Now search for volume up, and choose the shortcut which you want to use for screen brightness up. Head over to settings > Keyboard shortcuts. I don't know the exact syntax followed by dconf-editor, but I will tell you how to find the syntax. Open dconf-editor and search for screen-brightness-up and screen-brightness-down, and under custom-value change the value to the shortcut you want to set (will tell later how to know what to enter). I am on 20.04 and I used dconf-editor to adjust the screen brightness from keyboard shortcuts. This is a repost of my old answer from here If there is no such command, is it possible to do the same thing by writing a script instead? May I know if there is an approach in which I can set a command to incrementally increase brightness, and another to incrementally decrease brightness? In other words, is there a command I can enter such that the brightness is decreased or increased by 0.1 points? This might be due to my limited knowledge. But in the default version of Ubuntu, with the commands I have put in, I am only able to set a Low brightness, and a High brightness. When I remap the keyboard shortcut on KDE, I am able to incrementally increase the brightness as I wish. I have tried doing this, but I am not satisfied with the result. However, unlike the KDE desktop, the default version of Ubuntu does not have the brightness change option as one of the default keyboard shortcuts, and therefore, I will have to type the command myself. I am aware that the default version of Ubuntu 20.04 also has a settings panel for remapping keyboard shortcuts. If I am using Kubuntu, there are readily-available settings to remap the keyboard shortcuts for brightness changing. The hotkeys of a Chromebook become function keys when replacing ChromeOS with Ubuntu. First of all, I should clarify that I am attempting to run version 20.04 on a Chromebook.
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