In Device Manager, under System devices , you see a yellow mark on "Intel Serial IO I2C Host Controller" or the controller is missing entirely.
However, these devices are notorious for driver issues. A missing or corrupted I2C HID driver can result in a non-functional touchpad or touchscreen, often marked by a yellow exclamation mark in under "I2C HID Device." i2c hid device install
Unlike legacy PS/2 or even USB devices, I2C HID devices are directly wired to the motherboard’s bus. This allows for lower latency, reduced power consumption (critical for battery life), and advanced features like multi-touch gestures. In Device Manager, under System devices , you
For most users, simply installing the latest and Serial IO drivers from your laptop OEM will resolve the problem permanently. In Device Manager