Name (_HID, "FNBT0000") // Hardware ID Name (_CID, "PNP0C02") // Compatible ID (Plug and Play motherboard resources) Name (_UID, 0x00) Method (_STA, 0, NotSerialized)
Method (SGHK, 1, NotSerialized)
Return (0x0F) // Device present, enabled, shown in UI acpi\ven_fnbt&dev_0000
| Symptom | Root Cause | | :--- | :--- | | Unknown device in Device Manager (Code 28) | No driver installed. | | Brightness/volume keys do nothing | fujitsu64.sys missing; Windows doesn't receive ACPI event 0x80-0x87. | | Laptop wakes immediately after sleep | FNBT device exposes wake timers incorrectly; driver needed to mask _PRW . | | High CPU usage by System process (ACPI.sys) | Driver missing → Windows repeatedly polls broken ACPI method for button status. | | Docking station undetected | FNBT.DOCK method requires driver to invoke Notify on the dock device. |
If you see this ID in your Device Manager under "Other Devices" with a yellow exclamation mark, follow these steps to resolve it: DriverIdentifier Name (_HID, "FNBT0000") // Hardware ID Name (_CID,
In almost every case, this ID refers to the .
The Hardware ID breaks down as follows:
Compatible with Windows XP, 7, 8, 8.1, 10, and 11 (both 32-bit and 64-bit).
Note: Sometimes this is bundled inside a larger "Fujitsu Hotkey Utility" or "Fujitsu Driver Package." | | High CPU usage by System process (ACPI
