Issue

The touchpad on my Dell Inspiron 5406 2-in-1 is not functioning. The touchpad intermittently stops working, and restarting the computer has sometimes restored functionality in the past. The current issue has persisted despite multiple troubleshooting attempts.

The Touchpad option/toggle is completely absent from Windows Settings under Bluetooth & devices.

Device Manager Findings

Under Human Interface Devices, the I2C HID Device has a yellow warning triangle and reports:

This device cannot start. (Code 10)

The device's hardware IDs are:

ACPI\VEN_DLL&DEV_0945
ACPI\DLL0945

The I2C HID Device is using:

Driver Provider: Microsoft
Driver Date: 6/21/2006
Driver Version: 10.0.26100.8972

The Device Manager Events history repeatedly shows:

Device configured
Device not started
Device deleted
Device configured
Device not started

There are no resource conflicts reported under the Resources tab.

The HID-compliant mouse is present and does not have a warning triangle. There is no separate HID-compliant touch pad listed.

Intel I2C/Serial IO Controllers

Under System devices, both Intel I2C Host Controllers are present:

Intel(R) Serial IO I2C Host Controller - A0E8

Driver Provider: Intel Corporation
Driver Date: 1/19/2021
Driver Version: 30.100.2104.1

Intel(R) Serial IO I2C Host Controller - A0E9

Driver Provider: Intel Corporation
Driver Date: 1/19/2021
Driver Version: 30.100.2104.1

I downloaded and installed the Dell Intel Serial IO Driver 30.100.2104.1 A02, but it did not resolve the issue.

Troubleshooting Already Completed

I have already tried:

Multiple normal restarts
Complete power reset/power drain
Windows Update; no available updates
Dell Intel Serial IO driver installation/reinstallation
Uninstalling the I2C HID Device and restarting so Windows could rediscover it
Scanning for hardware changes
Windows Hardware and Devices troubleshooting
Booting into Safe Mode; the touchpad also does not work in Safe Mode
Updating the BIOS to the newest available BIOS for this Inspiron 5406 2-in-1
Checking BIOS for a touchpad/pointing-device setting; no touchpad option was present
Dell SupportAssist hardware diagnostics

Dell Diagnostic Results

The Dell hardware scan reported:

PASS:

Battery
PCI Bus
USB Status
Internal Hub
Fingerprint Reader
USB Composite
PCI
Camera
Bluetooth
Fan
Memory
CPU
Hard Drive

However, it reported:

PCI Status: WARNING

PCI Status Tests: DW-0 – Driver Error

BIOS

Current system:

Model: Dell Inspiron 5406 2n1
BIOS: Updated from Dell's previous version 1.35.0 (dated 2/13/2025) to the newer BIOS released 3/21/2025.

The touchpad remains nonfunctional after the BIOS update.

Requested Assistance

Because the I2C HID device continues to report Code 10 even after driver reinstallation, device removal/rediscovery, Safe Mode testing, BIOS updating, and power resets, I would like assistance determining whether this is a touchpad hardware failure, touchpad cable/connection issue, I2C communication problem, motherboard issue, or another hardware/firmware problem.

I would also appreciate guidance on whether the PCI Status DW-0 Driver Error is related to the I2C HID/touchpad failure.

I have already completed the standard Windows, driver, BIOS, Safe Mode, and power-reset troubleshooting, so I would prefer to proceed with more advanced diagnostics rather than repeating the same steps.

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