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.