Lenovo Yoga 9i 2-in-1 Gen 9 keyboard or trackpad is not working correctly

Keyboard and touchpad failures on the Yoga 9i are discussed at length on Lenovo's community and in repair guides, and the fixes run from a keystroke to a screwdriver. The first is a toggle: Fn+F10 turns the touchpad on and off on the Yoga 9i, and Settings, Bluetooth and devices, Touchpad must be On. Then the BIOS: restart, press F2 to enter the BIOS, and in the Configuration page make sure Internal Pointing Device is Enabled. Drivers come next: update the Intel Serial IO driver from Lenovo's support page, uninstall the old one in Device Manager, restart and reinstall, or use Lenovo Vantage's update. Some owners report both keyboard and touchpad disabled together, which points to a shared connection;

one repair guide says the touchpad ribbon is barely seated at assembly and can lose contact over time, so it may need reseating by a technician. In tablet and tent modes the keyboard is disabled by design. Pen and touch input on the Yoga 9i share the same digitiser family, so if the touch screen works and the touchpad does not, the fault is specific to the touchpad driver or its connection. Updating Windows and the touchpad driver and checking the BIOS setting covers most cases without opening the laptop. If the keyboard works but some keys act oddly after a drop or spill, test with the on-screen keyboard to see the pattern, because a dead column of keys points at a damaged keyboard ribbon rather than a driver.