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You may need to update the BIOS to the latest version, or its settings aren't configured correctly. If you decide to update the BIOS to the latest version or reconfigure its settings, be sure to follow your device manufacturer's specific instructions for doing so. Depending on the manufacturer and model of your device, you might be able to turn on and adjust the keyboard light via your PC's control panel menu.
Wall-mounted light switch fittings (known as 'plate switches') can contain one, two, three or even more individual switches (or 'gangs') that let you control a number of separate light fittings from one place. You can also get versions that give you two- and multi-way switching which allow you to control lights using two or more different switches, for example in a hallway. However, if it doesn’t light up, then look for a unique key, aka illumination icon on the keyboard (it might be available as a combination with Function keys), which can increase the brightness. Apple offers two sets of keys, while companies like HP use the same keys (F5, F9, or F11 keypress, or a dual-action Fn + F5, F9, or F11 keypress), Dell uses F10, and Lenovo uses Fn + Spacebar.Never take risks with electrical safety. Before you start any type of electrical work, you must follow these following safety precautions:
In the case of Apple keyboard, even if set the maximum level of brightness, the keyboard doesn’t light up, but in the case of HP or Dell, you can force it to turn on. Remember, this will depend on OEMs, but everyone will offer a unique key that can manage this. Using the Increase/decrease brightness buttons should work for certain models of Macs that run macOS Sonoma, Ventura, High Sierra, Mojave, Catalina, Big Sur, or Monterey.Some keyboards, like the Logitech G Pro desktop keyboard, will actually have a dedicated button that you can press to toggle the keyboard light on or off. In the case of the Logitech G Pro, you'll want to look for a button stamped with a sun icon with rays in the upper-right corner of the keyboard. There are three key things you'll need to do if you want to change from one-way control of a light to two-way switching. Firstly, you must replace the original switch with a two-way fitting. Then you'll need to install a new two-way switch at the second control point. And after that, you should link the two with 1mm 2 three-core-and-earth cable. Start by running the cable between the two switch positions and installing a mounting box at the new switch position. Top tip - Multi-way switching
LED keyboards have a different concept. If you fancy colorful lights that keep changing based on what you use, or you want to design your idea, then they fit well. I am using the Corsair LED keyboard, and I can choose a color for individual keys using their software. For certain MacBooks, that means opening Control Center, selecting Keyboard brightness, and then dragging its corresponding slider. This should work for some MacBook models that also run MacOS Monterey or Big Sur.Switches generally need a 16mm-deep mounting box - although some dimmers may need deeper boxes. Where your space is limited, or if you want a switch to be unobtrusive, you can fit narrow architrave switches into your door frames.