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home-lab/documentation/TOUCHPAD_TROUBLESHOOTING.md
Geir Okkenhaug Jerstad b2ce976a65 Add comprehensive touchpad troubleshooting documentation 
- Document ITE8353 touchpad issue on little-rascal
- List all attempted solutions and current status
- Provide next steps for further investigation
- Include useful debugging commands and references
2025-06-30 18:48:03 +02:00

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Touchpad Troubleshooting - Little Rascal (Lenovo Yoga Slim 7)

Problem

The touchpad on little-rascal (Lenovo Yoga Slim 7 14ARE05) is not working. The trackpad is detected as an I2C HID device but is being misidentified as a sensor hub instead of a proper touchpad.

Hardware Details

  • Model: Lenovo Yoga Slim 7 14ARE05
  • Touchpad Controller: ITE8353 (I2C HID)
  • Device Path: /sys/bus/i2c/devices/i2c-ITE8353:00
  • HID Device: 0018:048D:8353.0001
  • ACPI ID: PNP0C50 (HID-over-I2C precision touchpad)

Investigation Results

Device Detection

The touchpad controller is properly detected by the kernel:

  • I2C device exists at i2c-ITE8353:00
  • Driver binding: i2c_hid_acpi
  • HID device: 0018:048D:8353.0001

Problem: Misidentified as Sensor Hub

The device is being bound to hid-sensor-hub driver instead of a proper touchpad driver like hid-multitouch.

Attempted Solutions

  1. Added I2C HID kernel modules:

    • i2c_hid, i2c_hid_acpi, hid_multitouch
    • Added to both boot.kernelModules and boot.initrd.availableKernelModules

  2. Added kernel parameters:

    • i2c_hid.debug=1
    • acpi_enforce_resources=lax
    • i2c_hid_acpi.probe_defer=1

  3. Added udev rules:

    • Attempted to unbind from hid-sensor-hub and bind to hid-multitouch
    • Set proper permissions for the device

  4. Enabled libinput:

    • Configured touchpad settings in modules/desktop/input.nix
    • Added input utilities (evtest, xinput, libinput-gestures)

Current Status

  • ❌ Touchpad still not functional
  • ✅ Device is detected by kernel
  • ❌ Device is misidentified as sensor hub
  • ❌ No input events generated

Next Steps to Try

Option 1: BIOS Settings

Check BIOS for touchpad mode settings:

  • Look for "Touchpad Mode" setting
  • Try switching between "Basic" and "Advanced" modes
  • Some laptops have I2C/PS2 mode selection

Option 2: Kernel Patch

This appears to be a known issue requiring a kernel patch. Research:

  • Linux kernel patches for ITE8353 touchpad support
  • Check if newer kernels have better support
  • Look for device-specific quirks in the kernel

Option 3: Force PS/2 Mode

If I2C mode cannot be made to work:

  • Try to enable PS/2 emulation mode in BIOS
  • Some laptops can fall back to PS/2 touchpad mode

Option 4: Custom Driver

  • Check if ITE provides Linux drivers
  • Look for community-developed drivers for this specific controller

Option 5: Firmware Update

  • Update laptop firmware/BIOS
  • Some touchpad issues are resolved with firmware updates

Useful Commands for Further Debugging

# Check device binding
ls -la /sys/bus/i2c/devices/i2c-ITE8353:00/driver

# Check HID devices
cat /sys/bus/i2c/devices/i2c-ITE8353:00/0018:048D:8353.0001/modalias

# Monitor udev events
udevadm monitor --environment --udev

# Test input events
evtest

# Check kernel modules
lsmod | grep -E "(i2c|hid)"

References