Below are the relevant datasheets and technical documents ("papers") for the GT9xx family: Official Datasheets & Programming Guides GT911 Datasheet : The core 5-point touch controller documentation GT911 Datasheet (Leadtek Display) GT911 PDF (Elecrow) GT911 Programming Guide : Detailed register maps and I2C communication protocols GT911 Programming Guide (Crystalfontz) GT928 Datasheet

This setup is common in aftermarket car stereos where users are attempting to update firmware or recalibrate a "new" display panel to match the expected touch coordinates. Understanding the GT9xx Configuration The GT9xx series (including models like

: In the Linux/Android kernel, this configuration is defined in the Device Tree Source (DTS)