PCI\VEN_8086&DEV_51E9
Serial IO driver
PCI\VEN_8086&DEV_51E9 is the Intel Corporation Alder Lake PCH Serial IO I2C Controller #1, 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.
Device details
| Hardware ID | PCI\VEN_8086&DEV_51E9 |
|---|---|
| Device name | Alder Lake PCH Serial IO I2C Controller #1 |
| 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 PCH Serial IO I2C Controller #1 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 PCH Serial IO I2C Controller #1
- 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_51E9. - 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
VEN_8086&DEV_51C6Alder Lake-P Serial IO I2C Controller #1VEN_8086&DEV_51D8Alder Lake-P Serial IO I2C Controller #2VEN_8086&DEV_51D9Alder Lake-P Serial IO I2C Controller #3VEN_8086&DEV_51E8Alder Lake PCH Serial IO I2C Controller #0VEN_8086&DEV_51EAAlder Lake PCH Serial IO I2C Controller #2VEN_8086&DEV_51EBAlder Lake PCH Serial IO I2C Controller #3VEN_8086&DEV_54A4Alder Lake-N SPI (flash) ControllerVEN_8086&DEV_54A8Alder Lake-N Serial IO UART Host Controller
Device names: The PCI ID Repository, public data. We never host driver files: downloads come from the maker.