Acpi Fnbt0000 Driver Fix May 2026

This is the most reliable fix. Generic drivers will never properly support ACPI FnBT0000 because it requires OEM-specific ACPI tables.

For Dell laptops:

For Lenovo laptops:

For HP laptops:

For Acer laptops:

After installing these packages, return to Device Manager and check if the yellow mark on ACPI FnBT0000 has disappeared.

Perform a clean install of Windows using the Media Creation Tool, but immediately after the first boot, install your laptop manufacturer’s chipset driver before connecting to the internet. This prevents Windows Update from overwriting your correct ACPI driver with a generic one. acpi fnbt0000 driver fix

Toshiba has rebranded its support site (now often redirecting to Dynabook). You need the Toshiba Function Key Utility.

Note for older Acer models (2012-2018):
The driver is often called Launch Manager (LMv3 or LMv4). Without this, the FNBT0000 device will stay broken even with the correct INF file.

Try these solutions in order—most users will resolve the issue by Step 2. This is the most reliable fix

If you own a Dell laptop and none of the above work, Dell has a hidden command-line tool called DellCommand | Power Manager (formerly Dell Command | Configure). You can use it to reset the ACPI FnBT relationship.

Warning: This resets BIOS settings. Re-enable any custom settings (VT-x, boot order) afterward.

You open Device Manager and find an entry labeled "Unknown device". When you right-click it and select Properties > Details > Hardware Ids, you see something resembling: Reboot

This usually appears after performing a clean install of Windows (7, 8, 10, or 11) or after a major Windows update.

HP packages this driver under HP Software Framework or HP System Event Utility.