Pnp0ca0

Unplug the main power supply and disconnect connected USB-C devices.

A slightly different scenario occurs when the device exists but is disabled. In a Framework Laptop running Fedora Linux, extensive diagnostics traced an HDMI failure back to this issue. The USB-C port could transfer data but could not negotiate the DisplayPort Alt Mode because the _STA method returned (disabled). Similarly, MSI Stealth 14 AI Studio owners found their expensive Thunderbolt docks would not charge their laptops due to the PNP0CA0 ACPI device being disabled at boot. The BIOS logic simply returned Zero instead of 0x0F (enabled). pnp0ca0

Return (0x0F)

If you're experiencing issues with PNP0CA0, here are some troubleshooting steps you can take: Unplug the main power supply and disconnect connected

Did this error start after using a specific ? The USB-C port could transfer data but could

However, PNP0CA0 is not the only way to manage USB-C. Many modern systems instead bypass UCSI entirely and communicate directly with the USB Power Delivery (USB PD) controller chip via I2C, using a different ACPI identifier like INT3515 (for TI TPS6598x controllers). Direct communication is often considered superior because it gives the OS greater control compared to the more optional UCSI interface.