From 25b3c488e1027dedfec6cabf95e348303704a792 Mon Sep 17 00:00:00 2001
From: luqqas96 <282232570+luqqas96@users.noreply.github.com>
Date: Sun, 30 Aug 2026 02:21:20 +0200
Subject: [PATCH] udev: hide raw ithc input nodes duplicated by iptsd

On Tiger Lake devices (Surface Pro 7+/8), the ithc kernel driver exposes
raw "Intel Touch Host Controller" input nodes alongside the calibrated
virtual devices iptsd creates. The raw nodes report a 16:9 geometry that
does not match the 3:2 panel, and libinput picking both up causes
duplicate touch events and distorted coordinates near the edges.

This rule strips ID_INPUT/ID_INPUT_TOUCHSCREEN/ID_INPUT_TABLET from the
raw nodes so libinput only sees the calibrated IPTSD Virtual
Touchscreen/Stylus devices. Verified on a Surface Pro 7+ running Fedora.

Fixes #220
---
 etc/udev/50-iptsd.rules.in | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/etc/udev/50-iptsd.rules.in b/etc/udev/50-iptsd.rules.in
index d7b1352a..ef8f110a 100644
--- a/etc/udev/50-iptsd.rules.in
+++ b/etc/udev/50-iptsd.rules.in
@@ -2,3 +2,11 @@ SUBSYSTEM=="hidraw", ACTION=="add", TAG+="systemd", \
 	PROGRAM="@bindir@/iptsd-check-device --quiet $env{DEVNAME}", \
 	PROGRAM="/bin/systemd-escape --path $env{DEVNAME}", \
 	ENV{SYSTEMD_WANTS}+="iptsd@$result.service"
+
+# Hide the raw Intel Touch Host Controller (ithc) input nodes from libinput.
+# On Tiger Lake devices (e.g. Surface Pro 7+/8) these duplicate the calibrated
+# nodes iptsd publishes above ("IPTSD Virtual Touchscreen"/"IPTSD Virtual
+# Stylus") and report a 16:9 geometry on panels that are actually 3:2, causing
+# duplicate touch events and distorted coordinates near the edges.
+SUBSYSTEM=="input", ATTRS{name}=="Intel Touch Host Controller*", \
+	ENV{ID_INPUT}="", ENV{ID_INPUT_TOUCHSCREEN}="", ENV{ID_INPUT_TABLET}=""