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If your Logitech MX Keys backlight is off, first check the battery and room brightness: the keyboard can shut off its lighting automatically when the room is bright or the battery is at 10% or lower. Then test the brightness keys and the Backlighting setting in Logi Options+. These checks help separate expected behavior from a setting problem before you contact Logitech support.
Why your MX Keys backlight may be off
The original MX Keys uses an ambient light sensor to adjust its backlighting. Logitech’s examples for that model show L2 (25%) below 100 lux, L4 (50%) between 100 and 200 lux, and L0 (off) above 200 lux. Logitech says the keyboard has eight brightness levels. These are the original MX Keys’ published examples; behavior and available controls may vary across MX Keys models.
Low battery is another normal reason for the light to go out: Logitech says backlighting turns off at 10% battery, and the battery LED is red at 10% and below. If the keyboard has enough charge and you are testing in a dim room, the brightness keys or Logi Options+ settings may be responsible.
How to troubleshoot the MX Keys backlight
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Check the battery and charge the keyboard
Look for a red battery LED or a battery reading around 10%. Connect the USB-C cable to the port at the keyboard’s top right and allow it to charge, then test the backlight again. You can continue typing while the keyboard charges. Because Logitech’s general guidance notes that proximity-based backlighting may be disabled while some keyboards are charging, unplug the cable and retry if the light still behaves unexpectedly.
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Logitech MX Keys S Wireless Keyboard Low Profile Fluid Precise - Graphite- Fluid Typing Experience: Laptop-like profile with spherically-dished keys shaped for your fingertips delivers a fast, fluid, precise and quieter typing experience
- Automate Repetitive Tasks: Easily create and share time-saving Smart Actions shortcuts to perform multiple actions with a single keystroke with the Logi Options+ app (1)
- Smarter Illumination: Backlit keyboard keys light up as your hands approach and adapt to the environment; Now with more lighting customizations on Logi Options+ (1)
- More Comfort, Deeper Focus: Work for longer with a solid build, low-profile design and an optimum keyboard angle that is better for your wrist posture
- Multi-Device, Multi OS Bluetooth Keyboard: Pair with up to 3 devices on nearly any operating system (Windows, macOS, Linux, Googlebook OS) via Bluetooth Low Energy or included Logi Bolt USB receiver (2)
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Test in a dim room
Move the keyboard away from bright light and try again. You can briefly shade the ambient-light sensor as a diagnostic; Logitech identifies the sensor alongside the battery-status LED on the original MX Keys. If the backlight returns in dim conditions, its earlier shutoff in a bright room was consistent with automatic sensor behavior, not necessarily a fault. See Logitech’s MX Keys setup and behavior guidance.
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Use the brightness keys
Press the key marked with the illuminated-key or backlight symbol to increase brightness. Use its paired decrease key to cycle down through the levels. Logitech describes two backlight keys on MX keyboards and eight levels on the original MX Keys. Check the symbols printed on your particular keyboard; the exact key behavior can depend on the model and its Fn setting.
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Logitech MX Keys Advanced Wireless Illuminated Keyboard, Tactile Responsive Typing, Backlighting, Bluetooth, USB-C, Apple macOS, Microsoft Windows, Linux, iOS, Android, Metal Build (Black)- PERFECT STROKE KEYS - Spherically-dished keys match the shape of your fingertips, offering satisfying feedback with every tap
- COMFORT AND STABILITY - Type with confidence on a keyboard crafted for comfort, stability, and precision
- SMART ILLUMINATION -Hand proximity detection and automatic backlighting
- FLOW CROSS-COMPUTER CONTROL - Type on multiple computers in one fluid workflow
- MULTI-DEVICE & MULTI-OS - Compatible with Windows, macOS, Linux, iOS, and Android systems ? pair with up to three devices
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Check Backlighting in Logi Options+
Open Logi Options+, select your MX Keys keyboard, and choose Backlighting. Make sure the backlighting switch is on. Review brightness, duration, and battery-saving settings as well; which controls appear can depend on the model and app version. Logitech’s keyboard backlight guide recommends checking the software settings when lighting has been turned off.
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Check for software updates, then retest
After checking the settings, use Logi Options+ to check for available software updates and test the light again. Logitech says its older Firmware Update Tool for the original MX Keys is no longer supported or maintained, and recommends Logi Options+ for supported devices. Logitech does not say that a firmware update is a guaranteed fix for a backlight problem, so do not treat one as a repair promise.
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Logitech MX Keys S Combo Performance Wireless Keyboard and Mouse - Graphite- Engineered for Speed and Precision: MX Keys S Wireless Keyboard features fast fluid laptop-like typing combined with the fast, precise scrolling of MX Master 3S Wireless Mouse
- Fluid Typing Experience: Laptop-like profile with spherically-dished keys shaped for your fingertips delivers a fast, fluid, precise and quieter typing experience
- Scroll 1000 Lines Per Second: With MagSpeed, Logitech’s fastest and most precise scroll wheel (3), and an 8K DPI sensor, this Logitech Mouse tracks anywhere – even on glass (4)
- Automate Repetitive Tasks: Easily create and share time-saving Smart Actions shortcuts that perform multiple actions with a single keystroke with the Logi Options+ app (1)
- Smarter Illumination: Backlit keyboard keys light up as your hands approach and adapt to the environment; now with more lighting customizations on Logi Options+ (1)
When to contact Logitech support
If the battery is charged, the room is dim, the brightness controls have been tried, and Backlighting is enabled in Logi Options+, but no light appears, the basic published guidance does not establish whether the cause is a component or another fault. Contact Logitech support and check warranty options. The cited MX Keys guidance does not provide an owner repair procedure for the backlight hardware.
Quick Recap
Best Value
- Fluid Typing Experience: Laptop-like profile with spherically-dished keys shaped for your fingertips delivers a fast, fluid, precise and quieter typing experience
- Automate Repetitive Tasks: Easily create and share time-saving Smart Actions shortcuts to perform multiple actions with a single keystroke with the Logi Options+ app (1)
- Smarter Illumination: Backlit keyboard keys light up as your hands approach and adapt to the environment; Now with more lighting customizations on Logi Options+ (1)
- More Comfort, Deeper Focus: Work for longer with a solid build, low-profile design and an optimum keyboard angle that is better for your wrist posture
- Multi-Device, Multi OS Bluetooth Keyboard: Pair with up to 3 devices on nearly any operating system (Windows, macOS, Linux, Googlebook OS) via Bluetooth Low Energy or included Logi Bolt USB receiver (2)
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- Perfect Stroke Typing with Smart Keys (1): Type on keys shaped for your fingertips, with voice to text Dictation (4), Mic Mute/Unmute, and Emoji keys
- Mini Size, Mighty Powerful: A layout designed for effortless precision, with a minimalist form for an ergonomic keyboard that's portable and can travel wherever you get work done
- Smart Illumination: The wireless keyboard's backlit keys light up the moment your hands approach, and automatically adjust to suit changing lighting conditions
- Multi-Device, Multi OS: Pair MX Keys Mini compact keyboard with up to 3 devices on nearly any operating system via Bluetooth Low Energy and switch between them seamlessly
- Multiple Computers, One Flow: Team the slim MX Keys Mini with MX Master 3 or MX Anywhere 3 and type across multiple computers or laptops in one fluid workflow(1)
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