Goodix GT7868Q Linux Driver

This kernel module provides support for the Goodix GT7868Q touch controller. The module addresses a specific issue related to the Report Descriptor, specifically a duplicate description at byte position 605 and 607.

Please note that I've tested this kernel module on my ThinkBook 16+ 2024 IMH, but I cannot guarantee its functionality on other devices.

Build

To build the module, simply run:

make

Installation

Insert the Module

Load the module into the kernel using the following command:

sudo modprobe ./goodix-gt7868q.ko

To make these changes persistent on boot, install the module to the system modules directory:

sudo make install-dkms

Apply Libinput Quirks

To improve compatibility with libinput, follow these steps:

Copy the local-overrides.quirks file to /usr/share/libinput/60-custom-thinkbookg6p2024imh.quirks:

sudo make install-quirks

Explanation of the quirks

Adjust the default parameters to address issues with the device:

The default press-down pressure threshold is higher than palm detection threshold, preventing the cursor movement.
The maximum pressure detection is limited to 1000, even though the device report that supports up to 2000. Modify the AttrThumbPressureThreshold accordingly.
If you prefer, you can adjust the touch up and down pressure by setting the AttrPressureRange or remove pressure detection altogether by adding AttrEventCode=-ABS_MT_PRESSURE;-ABS_PRESSURE;.

Finally

Restart the display manager.