b2ce976a65
- 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
98 lines
3.1 KiB
Markdown
98 lines
3.1 KiB
Markdown
# Touchpad Troubleshooting - Little Rascal (Lenovo Yoga Slim 7)
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## Problem
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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.
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## Hardware Details
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- **Model**: Lenovo Yoga Slim 7 14ARE05
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- **Touchpad Controller**: ITE8353 (I2C HID)
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- **Device Path**: `/sys/bus/i2c/devices/i2c-ITE8353:00`
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- **HID Device**: `0018:048D:8353.0001`
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- **ACPI ID**: `PNP0C50` (HID-over-I2C precision touchpad)
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## Investigation Results
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### Device Detection
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The touchpad controller is properly detected by the kernel:
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- I2C device exists at `i2c-ITE8353:00`
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- Driver binding: `i2c_hid_acpi`
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- HID device: `0018:048D:8353.0001`
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### Problem: Misidentified as Sensor Hub
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The device is being bound to `hid-sensor-hub` driver instead of a proper touchpad driver like `hid-multitouch`.
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### Attempted Solutions
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1. **Added I2C HID kernel modules**:
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- `i2c_hid`, `i2c_hid_acpi`, `hid_multitouch`
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- Added to both `boot.kernelModules` and `boot.initrd.availableKernelModules`
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2. **Added kernel parameters**:
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- `i2c_hid.debug=1`
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- `acpi_enforce_resources=lax`
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- `i2c_hid_acpi.probe_defer=1`
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3. **Added udev rules**:
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- Attempted to unbind from `hid-sensor-hub` and bind to `hid-multitouch`
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- Set proper permissions for the device
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4. **Enabled libinput**:
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- Configured touchpad settings in `modules/desktop/input.nix`
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- Added input utilities (`evtest`, `xinput`, `libinput-gestures`)
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### Current Status
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- ❌ Touchpad still not functional
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- ✅ Device is detected by kernel
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- ❌ Device is misidentified as sensor hub
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- ❌ No input events generated
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## Next Steps to Try
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### Option 1: BIOS Settings
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Check BIOS for touchpad mode settings:
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- Look for "Touchpad Mode" setting
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- Try switching between "Basic" and "Advanced" modes
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- Some laptops have I2C/PS2 mode selection
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### Option 2: Kernel Patch
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This appears to be a known issue requiring a kernel patch. Research:
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- Linux kernel patches for ITE8353 touchpad support
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- Check if newer kernels have better support
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- Look for device-specific quirks in the kernel
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### Option 3: Force PS/2 Mode
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If I2C mode cannot be made to work:
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- Try to enable PS/2 emulation mode in BIOS
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- Some laptops can fall back to PS/2 touchpad mode
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### Option 4: Custom Driver
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- Check if ITE provides Linux drivers
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- Look for community-developed drivers for this specific controller
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### Option 5: Firmware Update
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- Update laptop firmware/BIOS
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- Some touchpad issues are resolved with firmware updates
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## Useful Commands for Further Debugging
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```bash
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# Check device binding
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ls -la /sys/bus/i2c/devices/i2c-ITE8353:00/driver
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# Check HID devices
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cat /sys/bus/i2c/devices/i2c-ITE8353:00/0018:048D:8353.0001/modalias
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# Monitor udev events
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udevadm monitor --environment --udev
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# Test input events
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evtest
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# Check kernel modules
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lsmod | grep -E "(i2c|hid)"
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```
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## References
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- [NixOS Hardware Configuration](https://github.com/NixOS/nixos-hardware)
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- [Linux I2C HID Documentation](https://www.kernel.org/doc/html/latest/input/devices/i2c-hid.html)
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- [Libinput Documentation](https://wayland.freedesktop.org/libinput/doc/latest/)
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