For computers with a light sensor, typically laptop computers, Windows 10 has the ability to automatically adjust the screen brightness depending on the ambient light levels.

• Laptops and PCs are mostly indoor creatures, so they don’t need to be as bright. 200 is on the low end but still usable, while above 400 is above average. Not many computer displays go above 500 or 600 nits, and you probably won’t need to use the full brightness on one of those very often.
• The IT guy’s bread and butter: “Turn it off and turn it back on again.” Odds are you’ve.

I accidentally lowered the brightness on my asus notebook to black. Now I cannot see the side bar for Windows 8. I've tried holding down the fn key and tapping the f6 (with the sun icon) but nothing happens.

This feature can be more annoying than helpful, either leaving your screen too dark or frequently adjusting the brightness levels.

Here’s three ways to disable the automatic screen brightness feature.

Method 1: using the systems setting

1. Open the Windows start menu and click on ‘Settings’ (a cog icon)
   
2. In the settings window, click on ‘System’
3. The ‘Display’ menu should be selected on the left, if it is not – click on ‘Display’
4. Un-tick ‘Change brightness automatically when lighting changes’

Help – I don’t have the ‘Change brightness automatically when lighting changes‘ option

If you don’t have the ‘Change brightness automatically when lighting changes’ option it’s likely your computer does not have a light sensor and therefore does not have the automatic brightness feature.

If you’re sure your computer does have a light sensor – try checking the manufactures website for the correct driver and/or software package. It is possible that Windows 10 support is not provided.

In this case you will need to use the manual brightness adjustments. On laptops, these are usually done using buttons on or new the keyboard – sometimes in combination with a Fn (function) key. For desktop computers, the monitor will have buttons and a menu on the front or the side of the monitor.

Help – ‘Change brightness automatically when lighting changes’ won’t change

If your laptop is connected to two screens – in extended mode – the ‘Change brightness automatically when lighting changes’ option won’t change.

This appears to be a bug with Windows 10.

Method two: change the power plan advanced options

1. Open the Windows start menu and click on ‘Settings’
2. In the settings window, click on ‘System’
3. Click on ‘Power & sleep’ in the left hand menu, then click on the ‘Additional power settings’ link
4. For the power plan you currently have enabled (balanced by default – the enabled plan will be bold), click on ‘Change plan settings’.
5. Click on ‘Change advanced power settings’
6. Expand ‘Display’ -> ‘Enable adaptive brightness’ and make sure the setting is set to ‘Off’
7. Click ‘OK’ to save the changes.

Desktop Brightness Low Fix

Help – The ‘Adjust my screen brightness automatically’ option is greyed out

Asus Laptop Brightness Too Low Carb

This issue sounds like a driver support issue – for example the wrong software for the video card is installed.

In this case, you can try

Asus Screen Brightness Windows 10

1. installing the latest driver / software updates from the laptop manufactures website
2. opening the computer Device Manager and changing the driver for the video card to the Microsoft basic driver.