When your computer is running on battery power or when the system is idle, PNP0CA0 helps to:
## Understanding `pnp0ca0` – ACPI Ambient Light Sensor
Some laptops have ACPI tables that disable the UCSI device if they detect a non-Windows OS, which may require specialized kernel parameters to fix. pnp0ca0
Forcing Windows to redetect the component can drop the failure flag.
Are you currently troubleshooting a issue or looking for more technical ACPI specification details? [TRACKING] Controlling Power Direction for USB C - Linux When your computer is running on battery power
If the USB-C controller is stuck in a bad state, a hard reset can force it to reinitialize.
Restart your computer. Windows will re-examine the ACPI tree upon boot and cleanly reload the driver. [TRACKING] Controlling Power Direction for USB C -
Often, Microsoft keeps a generic version of these bus drivers in their repository. Go to . Click Check for updates .
If ((USTC == One)) (UCMS == 0x02)))
The computer's firmware is outdated and cannot properly handle USB-C power delivery negotiation.