From d97896b647690d5e73686ed3f26b739bd27d62cb Mon Sep 17 00:00:00 2001 From: huchangzai Date: Tue, 17 Mar 2026 10:01:42 +0800 Subject: [PATCH] hwdb: fix ABS_PRESSURE axis range for Goodix GXTP5100 touchpad The Goodix GXTP5100 touchpad (HID bus 0x0018, vendor 0x27C6, product 0x01E9), found in the Lenovo ThinkBook 16 G7+ IAH and ThinkPad X9 15 Gen 1, has a kernel driver bug where ABS_PRESSURE (axis 24 / 0x18) is reported with min=0, max=0. This invalid axis range causes libinput to reject the device with: "kernel bug: ABS_PRESSURE has min == max (both 0)" The touchpad hardware itself is functional and reports valid ranges for all other axes: ABS_X: min=0, max=4149, resolution=31 ABS_Y: min=0, max=2147, resolution=27 ABS_MT_POSITION_X/Y: valid ranges Root cause: the kernel hid-multitouch driver applies a "GT7868Q report descriptor fixup" to this device (the HID descriptor is malformed and fails hid-generic probe with EINVAL). The fixup corrects most axes but leaves ABS_PRESSURE with an invalid 0:0 range. This hwdb entry overrides ABS_PRESSURE to a valid 0:255 range, allowing libinput to accept and initialize the device. Kernel version: 6.17.0-19-generic Device path: /sys/bus/hid/drivers/hid-multitouch/0018:27C6:01E9.0001 --- hwdb.d/60-evdev.hwdb | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/hwdb.d/60-evdev.hwdb b/hwdb.d/60-evdev.hwdb index 92b43fe1b2..767b63f835 100644 --- a/hwdb.d/60-evdev.hwdb +++ b/hwdb.d/60-evdev.hwdb @@ -421,6 +421,17 @@ evdev:name:Atmel maXTouch Touch*:dmi:bvn*:bvr*:bd*:svnGOOGLE:pnSamus:* EVDEV_ABS_35=::10 EVDEV_ABS_36=::10 +######################################### +# Goodix +######################################### + +# Goodix GXTP5100 Forcepad (Lenovo ThinkBook 16 G7+ IAH, ThinkPad X9 15 Gen 1) +# The kernel hid-multitouch driver reports ABS_PRESSURE with min==max==0, +# an invalid range that causes libinput to reject the device entirely. +# Override ABS_PRESSURE (axis 0x18=24) to a valid range. +evdev:input:b0018v27C6p01E9* + EVDEV_ABS_18=0:255:0:0 + ######################################### # Granite Devices Simucube wheel bases #########################################