You pressed the usual combination Fn + F5/F6 or special multimedia keys, but the screen does not dim and the speakers continue to play at maximum volume? The problem with the brightness and sound adjustment buttons not working is one of the most common on laptops of all brands, from budget Acer up to bonus MacBook Pro. In 80% of cases, it can be fixed independently, without resorting to the help of a service center.

In this article we will analyze all possible reasons - from a banal driver failure to physical wear and tear of the keyboard, and also give step by step instructions for each of them. We will pay special attention hidden BIOS settings, which are often overlooked even by experienced users, and we’ll tell you how to regain control without reinstalling Windows. If your laptop is among those affected, read on.

1. Software failures: drivers and system conflicts

In 60% of cases the software is to blame. Most often, the problem occurs after updating Windows, installing new drivers, or a conflict between manufacturer utilities (for example, Lenovo Vantage and standard Windows 11 tools). Let's look at the key "weak points".

Keyboard and function key drivers - the first stage of verification. Even if there are no exclamation marks in the Device Manager, this does not guarantee that they will work correctly. Especially relevant for laptops ASUS, HP And Dell, where proprietary utilities like ASUS Armoury Crate or Dell QuickSet.

  • 🔄 Reset drivers: Uninstall the current keyboard drivers through the “Device Manager” (section “Keyboards”), then restart the laptop - Windows will install the standard ones.
  • 📥 Official drivers: Download the latest version from the manufacturer's website (not through Windows Update!). For Lenovo look for the package Hotkey Features Integration.
  • ⚙️ Utility conflict: Disable all startup programs like HP Support Assistant or MSI Center - they can block standard hotkeys.

Critical detail: On laptops with hybrid graphics (Intel + NVIDIA/AMD), a crash in the graphics card drivers may disable brightness adjustment. Check it out via NVIDIA Control Panel → Manage 3D Settings or AMD Radeon Software.

📊 What brand is your laptop?
  • ASUS
  • Lenovo
  • HP
  • Dell
  • Acer
  • Apple
  • Other

2. BIOS/UEFI settings: hidden management options

Many users are unaware that function keys can be disabled at the BIOS level. This often happens after a factory reset, firmware update, or experimenting with overclocking. For example, in laptop BIOS MSI there is a separate parameter Hotkey Mode, which switches priority between multimedia functions and standard F1-F12.

How to check:

  1. Reboot your laptop and enter the BIOS (usually the F2, Del or Esc).
  2. Find a section Advanced → System Configuration (names may vary).
  3. Look for options like:
    • Action Keys Mode (y Lenovo) - should be Enabled.
    • Function Key Behavior (y Dell) — select Multimedia Key First.
    • Hotkey Mode (y ASUS/MSI) - turn it on.
  • Save changes (F10) and reboot.
    • ⚠️ Attention: On some laptops HP (for example, series Pavilion or Envy) Resetting the BIOS to factory settings automatically disables function key support. After resetting, be sure to check the parameter Legacy Support - it must be disabled.
    What to do if the BIOS does not have the necessary settings?

    If your BIOS does not have the mentioned settings, it may mean that the manufacturer has disabled them for your model. In this case try:

    1. Update the BIOS firmware to the latest version (download from the official website!).

    2. Use software alternatives (see section 4).

    3. Check the keyboard for hardware faults (section 5).

    3. Conflicts with Windows: Control Centers and Policies

    Windows 10 and 11 have built-in brightness and sound controls that sometimes conflict with manufacturer's drivers. For example, after upgrading to Windows 11, many users Lenovo IdeaPad We encountered the fact that the volume keys work, but the brightness keys do not. The reason for this was the new policy for managing displays via Windows Mobility Center.

    Check the following points:

    • 🖥️ Windows Mobility Center: Click Win + X → “Mobility Center”. If the brightness slider is locked, the problem is with the display drivers.
    • 🔊 Sound devices: Right-click on the speaker icon in the tray → “Open sound options” → “Device properties”. Make sure the correct output is selected (not HDMI or Bluetooth).
    • 📝 Group policies: Click Win + R, enter gpedit.msc → go to User Configuration → Administrative Templates → Windows Components → Power Manager. Parameter Disable brightness adjustment must be Not specified.
    Symptom Probable Cause Solution
    Volume keys work, brightness keys don't Graphics driver failure Update the driver via Device Manager or manufacturer's website
    Brightness keys work, volume keys don't Sound driver conflict (Realtek/NAHIMIC) Remove all sound drivers and install clean ones from the manufacturer's website
    None of the keys respond Disabled Action Keys Mode in BIOS Enable the option in BIOS (see section 2)
    The keys only work when pressed Fn Incorrect setting Function Key Behavior Change the setting in BIOS to Multimedia Key First

    ☑️ Checking conflicts in Windows

    Done: 0 / 1

    4. Alternative control methods without function keys

    If you couldn't restore the keys to work, don't despair - there are several ways to control the brightness and volume programmatically. These methods will also come in handy if the physical keys have failed.

    To adjust brightness:

    • 🌞 Windows hotkeys: Win + A → brightness slider in the notification panel.
    • 💡 PowerShell: Open PowerShell as administrator and type: 
      (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1, 50)

      where 50 — brightness level (0–100).

    • 🖥️ Third party utilities: Brightness Tray (for Windows 7–11) or Monitorian (with support for multiple monitors).

    To adjust the volume:

    • 🔈 Keyboard shortcuts: Win + F2/F3 (on some laptops), Alt + Shift + Arrows.
    • 🎛️ Sound control panel: Click on the speaker icon in the tray → adjust the sliders.
    • 🤖 Voice commands: In Windows 11, you can say “Hey Cortana, turn up the volume by 20%.”
    💡

    If you often work with an external monitor, install the utility DisplayFusion. It allows you to control the brightness of each display separately, even if the standard laptop keys do not work.

    5. Hardware faults: when the keyboard or cable is to blame

    If software methods do not help, the problem may lie in physical damage. Most often they suffer:

    • 🔧 Keyboard cable - oxidation or broken contacts (typical for laptops) Samsung And Toshiba over 5 years old).
    • ⌨️ Keyboard membrane layer — wear or contamination (especially if the keys no longer press “softly”).
    • 🔌 Keyboard controller — microcircuit combustion (rare, but happens after a short circuit).

    How to diagnose:

    1. Connect external USB keyboard. If the function keys work on it, the problem is in the laptop keyboard.
    2. Try pressing the keys with force. If they trigger when pressed hard, the worn membrane layer is to blame.
    3. Shine a flashlight under the keys. If oxidation or traces of liquid are visible, cleaning or replacement is required.
    ⚠️ Attention: On laptops MacBook Pro (2016–2019) problem with brightness keys not working is often related to butterfly keyboard defect. Apple has recognized this defect and is offering free repairs under the program. Keyboard Service Program — check the serial number on the support site.

    6. Viruses and malware: the reason is not obvious

    Rare, but apt: some viruses and mining scripts block function keys so that the user cannot detect their activity (for example, reduce the brightness and notice increased load on the GPU). There are also cases where adware (adware) replaced hotkeys with its own commands.

    How to check:

    • 🛡️ Windows Defender Scanner: Run a full scan (Windows Defender → Virus Protection → Advanced Scan).
    • 🔍 Utilities like Malwarebytes or AdwCleaner: They find adware that standard antivirus programs miss.
    • 📊 Task Manager: Sort processes by CPU/GPU load. Unknown processes with high consumption are cause for suspicion.

    If a virus is found:

    1. Remove it and reboot your laptop.
    2. Reset your keyboard: Settings → Devices → Keyboard → Reset.
    3. Check startup (Ctrl + Shift + Esc → Startup) for the presence of suspicious programs.
    💡

    If the keys do not work after removing the virus, restore the Windows registry. To do this, enter in the command line (as administrator): sfc /scannow, then DISM /Online /Cleanup-Image /RestoreHealth.

    7. Features of specific brands: what you need to know

    Each manufacturer has its own “tricks” that can affect the operation of the function keys. Here are the most common nuances:

    Brand Typical problem Solution
    Lenovo Conflict between Lenovo Vantage and standard drivers Remove Vantage via “Settings → Applications” and install Lenovo Hotkey Driver
    HP Brightness keys not working after BIOS update Roll back to a previous BIOS version or install HP SoftPaq for keyboard
    ASUS Armoury Crate blocks standard hotkeys Disable Armoury Crate in startup or reinstall it
    Dell The keys only work when pressed Fn Enable in BIOS Function Key Behavior → Multimedia Key First
    MacBook Brightness keys not responding after macOS update Reset NVRAM (turn off your Mac, then hold Option + Command + P + R 20 seconds)

    For laptops Acer And MSI typical problem with lack of driver ACPI, which is responsible for processing function keys. In this case, download the package ATK Package (for Acer) or SCM (for MSI) from the official website.

    FAQ: Answers to frequently asked questions

    Could the keys not work because a second monitor is connected?

    Yes, especially if the primary display is disabled in Windows settings. Check:

    1. Click Win + P and select Computer screen only.
    2. Open Settings → System → Display and make sure the primary monitor is selected correctly.

    If the brightness keys do not work only on the external monitor, this is normal: they only control the built-in display.

    After updating Windows, the volume keys stopped working. What to do?

    This is a typical problem due to driver conflict. Try:

    • Roll back to the previous version of the audio driver through Device Manager.
    • Remove all sound drivers, then install them again from the laptop manufacturer's website (not through Windows Update!).
    • Check if the software is installed Nahimic or Dolby Atmos — they often block standard keys.

    For Windows 11, additionally run the command in PowerShell:

    Get-AppxPackage *WindowsAudioDevice* | Remove-AppxPackage

    then reboot your laptop.

    The brightness keys work, but the screen does not respond. What's the matter?

    Most likely the problem is graphics adapter driver or power plan. Do the following:

    1. Update your video card driver (via Device Manager or the manufacturer's utility, for example, GeForce Experience for NVIDIA).
    2. Reset the power plan: Settings → System → Power and sleep → Advanced power settings → Power plan settings → Restore default settings.
    3. Check if brightness control is disabled in the graphics settings. For Intel: open Intel Graphics Control Panel → Power supply → Adjusting the display brightness.

    If the laptop has AMD Radeon, try disabling the function Vari-Bright in the driver settings.

    There are no brightness keys on the laptop keyboard. How to regulate?

    Use alternative methods:

    • Windows hotkeys: Win + A → brightness slider.
    • Mobility Center: Win + X → “Windows Mobility Center”.
    • Third party utilities: Brightness Controller (portable, no installation required) or Twinkle Tray (for fine tuning).
    • Graphics Control Panel: For NVIDIA — NVIDIA Control Panel → Display → Adjust Color Settings.

    On some laptops (eg Lenovo Yoga) Brightness is adjusted by gestures on the touchpad - swipe two fingers left/right along the top of the touchpad.

    Can I fix the keyboard myself if the keys don't work?

    Yes, but only if the problem is contact contamination or oxidation. To do this:

    1. Turn off your laptop and remove the battery (if possible).
    2. Carefully remove the keyboard (usually it is secured with latches; look for instructions for your model on YouTube).
    3. Clean the cable contacts with alcohol (at least 90%) and a soft brush.
    4. Check the integrity of the cable - if it is torn, it will need to be replaced.
    ⚠️ Attention: If you are not confident in your skills, it is better to contact the service. Damage to the cable due to careless removal of the keyboard can lead to complete inoperability of the device.

    For laptops Apple Do-it-yourself repair is not recommended - it will void the warranty and may damage the battery.