File add_s620.patch of Package xf86-input-wacom
--- xf86-input-wacom-1.2.3/conf/70-wacom_orig.conf 2024-10-30 00:54:42.000000000 +0300
+++ xf86-input-wacom-1.2.3/conf/70-wacom.conf 2025-08-05 06:14:01.051280871 +0300
@@ -84,3 +84,11 @@
MatchIsTouchscreen "true"
Driver "wacom"
EndSection
+
+#Gaomon S620
+Section "InputClass"
+ Identifier "GAOMON Gaomon Tablet"
+ MatchUSBID "256c:*"
+ MatchDevicePath "/dev/input/event*"
+ Driver "wacom"
+EndSection