Run a system scan within the app to automatically fetch the power management drivers.
When the Acpi Fnbt0000 driver is missing, outdated, or corrupted, Windows cannot talk to the corresponding hardware. You will likely notice one or more of the following issues:
That is a Manufacturer Hardware ID mismatch. If you see this on a non-Lenovo device, someone force-installed the wrong driver. Uninstall it immediately and clear the driver cache.
The importance of the ACPI FNBT0000 driver's correct identifier is evident in its development history, especially within the Linux kernel. Engineers discovered that the ACPI system reported the device ID in uppercase ("FNBT0000"), but the driver initially looked for a mixed-case version ("FnBT0000").
Go to (Windows 10) or Windows Update (Windows 11). Click on Advanced options , then select Optional updates . Expand the Driver updates section.
The FNBT0000 code is a . You will typically see it in your Device Manager as one of three similar identifiers:
Corrupt ACPI.sys or WDF (Windows Driver Framework) files can mimic a driver issue.