Handled by the ucsi_acpi kernel module, which communicates with the system's Embedded Controller (EC). 3. Common Use Cases & Diagnostics
A clean boot starts Windows with a minimal set of drivers and startup programs, helping you identify if a background application is causing the conflict.
The identifier refers to the UCSI USB Connector Manager . pnp0ca0
Open a terminal and run the following commands to check for the existence and status of the device:
Because PNP0CA0 relies entirely on the system's Embedded Controller, a standard software reboot rarely clears stuck hardware registers. A hard physical power cycle resets the controller's logic: Shut down the computer completely. Handled by the ucsi_acpi kernel module, which communicates
One common point of confusion is mistaking pnp0ca0 for a separate error with the code 0x000000CA or PNP_DETECTED_FATAL_ERROR . While they are different, they can be related.
Because the PNP0CA0 hardware definition block originates straight out of your machine’s ACPI DSDT tables in the BIOS, an outdated BIOS can introduce immediate incompatibilities with newer Windows 11 updates. The identifier refers to the UCSI USB Connector Manager
: It is commonly found in laptop BIOS code (DSDT tables) to define the mailbox communication between the BIOS/OS and the hardware controller. BIOS Implementation of UCSI
Allowing a single USB-C port to act as a power consumer (charging the laptop) or a power provider (charging a connected phone).