FNBT0000 is a symptom of lazy firmware engineering. Instead of using standard ACPI methods like _HID (Hardware ID) with a registered PnP ID (e.g., PNP0C32 for a wireless control button), the OEM invented a custom ID. They then wrote a kludge driver for Windows, but never submitted it to Microsoft's Update Catalog. For Linux users, this is a non-issue—the acpi_osi kernel parameter or a simple acpi_listen script can bind the event. But on Windows 10? You're left with a permanent yellow flag unless you dig up a 2015-era OEM driver.
When you see a yellow exclamation mark next to in Device Manager, it usually means one of the following: acpi fnbt0000 0 driver windows 10
FNBT0000 follows the vendor-specific pattern, suggesting a proprietary component. FNBT0000 is a symptom of lazy firmware engineering