PCI\VEN_8086&DEV_51A4

Alder Lake-P PCH SPI Controller driver

PCI\VEN_8086&DEV_51A4 is the Intel Corporation Alder Lake-P PCH SPI Controller, a Serial IO device. It connects the touchpad, sensors or buttons on many laptops. If it has no driver the touchpad or rotation sensor may not work. Get it from Windows Update or your PC maker first; the chip maker's own package is on intel.com.

Download from intel.com Full guide: Get the Intel Serial IO driver

Device details

Hardware ID	`PCI\VEN_8086&DEV_51A4`
Device name	Alder Lake-P PCH SPI Controller
Maker	Intel Corporation (PCI vendor ID 8086)
Device type	Serial IO
Driver guide	Get the Intel Serial IO driver
Known OEM variants	2

PCs and boards that use this chip

Each line is a subsystem ID: the full hardware ID ends in SUBSYS_ plus these eight characters when the Alder Lake-P PCH SPI Controller is built into that maker's product.

Full hardware ID ending	Maker	Product
`SUBSYS_0B101028`	Dell	Precision 3571
`SUBSYS_0C061028`	Dell	Precision 3580

If your SUBSYS matches a laptop or board maker in this list, that maker's support page has the version tested for your model.

How to install the driver for Alder Lake-P PCH SPI Controller

Confirm the ID. In Device Manager, right-click the device, open Properties, then Details, and pick Hardware Ids. The first line should start with PCI\VEN_8086&DEV_51A4.
Try Windows Update. Settings, Windows Update, Advanced options, Optional updates. Serial IO drivers are rarely offered here, so the PC maker is the main source.
Check your PC maker. Enter your model or serial number on its support site and look under Chipset.
Use the chip maker's package. Intel Serial IO Driver for 11th Generation Intel NUC products (SetupSerialIO.exe) on intel.com. Our get the intel serial io driver guide explains which package fits.
Restart and check. Test the touchpad and any sensors after the restart.

Other Intel serial io IDs

Device names: The PCI ID Repository, public data. We never host driver files: downloads come from the maker.