When function keys stop working on an Acer laptop, the most common reality is that they didn’t stop — they changed jobs. Acer ships with the Fn row defaulting to media actions on many models, so F5 adjusts something instead of refreshing. One accidental Fn+F-something press, and the whole row seems broken.

Acer’s function-key behavior lives in three places: the Fn-lock toggle, the BIOS setting, and Acer’s own drivers (Quick Access and the keyboard filter). A Windows update can disturb the drivers; a BIOS update can reset the default; and the toggle itself is one keystroke away from flipping everything.

The fixes below start with the five-second checks and move inward to drivers and hardware.

One clarification that saves confusion: on Acer laptops, function keys and special media keys are two modes of the same physical row, flipped by the Fn-lock toggle. Most reports of dead function keys are really reports of the row being in the wrong mode — which is why the toggle test in Fix 1 comes before any driver work.

Why this happens

  • Fn lock in the wrong mode: Acer’s Fn-lock toggle flips the entire row between function keys and media keys with a single keystroke.
  • BIOS function-key default reset: BIOS updates or CMOS resets can change the default row behavior without any notice in Windows.
  • Acer Quick Access driver missing: Quick Access carries Fn-key handling on many Acer models; without it, combinations silently fail.
  • Generic keyboard driver substituted: Windows replacing Acer’s keyboard filter with a generic HID driver kills Fn combinations.
  • Sticky Keys / Filter Keys interference: Accessibility features intercept the key combinations you are testing.
  • Fast Boot incomplete initialization: Aggressive fast boot can leave the embedded controller’s key handling half-initialized.
  • Key remapping software: PowerToys, AutoHotkey, or gaming utilities can swallow Fn combos.
  • Hardware fault in the keyboard matrix: Liquid damage or ribbon cable issues kill keys regardless of software settings.

How to fix it

Work through these in order — diagnose first, then act.

Fix 1: Toggle Fn lock and identify your mode

Settle the mode question in seconds.

  1. Press Fn + Esc (on some Acer models Fn + F12 or a dedicated Fn-lock key) and watch for the on-screen indicator.
  2. Press F5 alone: page refresh means function-key mode; media action means multimedia mode.
  3. Press Fn + F5 and confirm it does the opposite action — that proves the toggle and both layers work.
  4. If nothing works in either mode, the problem is deeper than the toggle. Continue.

Fix 2: Set the default in BIOS

Make the behavior permanent at the hardware level.

  1. Reboot and press F2 to enter BIOS setup.
  2. Look under Main or Advanced for Function key behavior / Fn key behavior.
  3. Select Function keys (or Special keys, depending on which default you prefer).
  4. Save and exit, then test in Windows.

Fix 3: Reinstall Acer Quick Access and keyboard drivers

Restore Acer’s Fn-handling software layer.

  1. From Acer support, download Acer Quick Access and any Keyboard driver for your exact model.
  2. In Device Manager → Keyboards, uninstall each keyboard device.
  3. Install Quick Access first, reboot, then install the keyboard driver if separate.
  4. Test Fn combinations (Fn+F5 brightness, Fn+F8 volume, etc.).

Fix 4: Check NitroSense/PredatorSense on gaming models

Gaming Acers route some Fn functions through their control apps.

  1. Open NitroSense or PredatorSense and check for keyboard or hotkey settings.
  2. Ensure the app’s services are running — check services.msc for Acer services set to Automatic.
  3. If you uninstalled Acer software, reinstall Acer Quick Access from Acer support; it carries the Fn components.

Fix 5: Eliminate accessibility and remapper interference

Something else may be eating your keystrokes.

  1. Go to Settings → Accessibility → Keyboard; turn off Sticky keys and Filter keys.
  2. Quit PowerToys Keyboard Manager, AutoHotkey, and gaming macro tools, then retest.
  3. Boot into Safe Mode and test the Fn row — working keys there indict a third-party program.

Fix 6: Update BIOS and isolate hardware

Prove whether this is software or the keyboard itself.

  1. Connect a USB keyboard and test its F1–F12 row. Working external keys isolate the fault to the built-in keyboard handling.
  2. Check Acer support for a newer BIOS for your model and install it; re-check the Fix 2 setting afterward since updates reset it.
  3. Test the built-in keys in BIOS setup itself — failure there means hardware.

Fix 7: Inspect for physical keyboard damage

When software is exhausted, look at the hardware.

  1. Open a text editor and map exactly which keys fail, with and without Fn — a dead block suggests ribbon or matrix damage.
  2. Look for signs of liquid exposure around the keyboard.
  3. On models with a removable keyboard, reseat the ribbon cable per the service manual.
  4. Multiple dead keys after liquid damage means keyboard replacement; individual key failure can sometimes be a single switch.

Fix 8: Load BIOS defaults as a final reset

When every software fix has failed but the keys work in BIOS, corrupted firmware settings can still be the cause. A defaults load clears them.

  1. Reboot into BIOS (F2) and choose Load Default Settings or Load Optimized Defaults.
  2. Re-apply the Function key behavior setting from Fix 2 afterward, since defaults may set the row to multimedia mode.
  3. Save, exit, and test in Windows.
  4. If keys work in BIOS but still not in Windows after a defaults load, the problem is definitively Windows-side — persist with the driver and Safe Mode steps rather than suspecting hardware.

Closing

Acer function-key issues are almost always the mode toggle, the BIOS default, or Acer’s Quick Access driver — in that order of likelihood. The Fn+Esc test in Fix 1 tells you within seconds whether you have a configuration problem or a real failure. Only when keys fail in BIOS itself should you start thinking about hardware. For the general Windows-level approach, our function-key troubleshooting guide covers the brand-neutral steps. Still on Windows 10? The Windows 10 function-key guide covers the older OS specifics. General keyboard troubleshooting guidance is available at Microsoft Windows support .

Frequently asked questions

How do I lock the Fn key on an Acer laptop?
Press Fn + Esc (or Fn + F12 on some models) to toggle Fn lock. The on-screen indicator shows whether F1-F12 now act as function keys or media keys by default. For a permanent default, set Function key behavior in BIOS.
Why are my Acer function keys doing media actions instead of F1-F12?
The row is in multimedia mode — either the Fn-lock toggle was pressed or the BIOS default is set that way. Press Fn + Esc to flip it, or change Function key behavior in BIOS (F2 at boot) to ‘Function keys’.
Do I need Acer Quick Access for function keys?
For Fn combinations like brightness, volume, and the touchpad toggle on many Acer models, yes — Acer Quick Access carries the key-handling layer. If those combos died after a Windows update or after removing Acer software, download Quick Access from Acer support for your exact model, install it, reboot, and retest the combinations.
Why do function keys work in BIOS but not Windows?
That split proves it is a Windows-level problem: the generic keyboard driver replaced Acer’s filter, or a remapper or accessibility feature is intercepting keys. Reinstall the Acer keyboard driver and Quick Access, turn off Sticky Keys and Filter Keys in Accessibility settings, and test in Safe Mode to confirm a third-party culprit.