From 495871f182ff27dbd6f00b053f729f7a40c570c9 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Fri, 3 Jul 2020 21:36:51 +0200
Subject: tv x220: fix jumpy touchpad

---
 tv/2configs/hw/x220.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tv/2configs/hw/x220.nix b/tv/2configs/hw/x220.nix
index 699b4a87e..61b475537 100644
--- a/tv/2configs/hw/x220.nix
+++ b/tv/2configs/hw/x220.nix
@@ -15,6 +15,15 @@
         pkgs.tpacpi-bat
       ];
     }
+
+    # fix jumpy touchpad
+    # https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_X220#X220_Touchpad_cursor_jump/imprecise
+    {
+      services.udev.extraHwdb = /* sh */ ''
+        touchpad:i8042:*
+         LIBINPUT_MODEL_LENOVO_X220_TOUCHPAD_FW81=1
+      '';
+    }
   ];
 
   boot.extraModulePackages = [
-- 
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