path: root/doc
diff options
authorPeter Hutterer <>2015-12-14 12:44:05 +1000
committerPeter Hutterer <>2015-12-14 12:44:05 +1000
commit6261e4e61fad1fabe74f3eba1227208ba5d32dfe (patch)
treecbfe0250994504b5613704b91fcc615e07290214 /doc
parentf0a57fc97a1fa008ec42719fadc91f4c5b8a4d67 (diff)
parent53c28a7d75a0a22bc96d780b9082fd6d8d3ed741 (diff)
Merge branch 'master' into tablet-support
Diffstat (limited to 'doc')
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/device-configuration-via-udev.dox b/doc/device-configuration-via-udev.dox
index f615cc1e..79870736 100644
--- a/doc/device-configuration-via-udev.dox
+++ b/doc/device-configuration-via-udev.dox
@@ -117,4 +117,22 @@ defaults or any other reason. The effects of setting these properties, the
format of the property and the value of the property are subject to change
at any time.
+@subsection model_specific_configuration_x220fw81 Lenovo x220 with touchpad firmware v8.1
+The property <b>LIBINPUT_MODEL_LENOVO_X220_TOUCHPAD_FW81</b> may be set by a
+user in a local hwdb file. This property designates the touchpad on a Lenovo
+x220 with a touchpad firmware version 8.1. When this firmware version is
+installed, the touchpad is imprecise. The touchpad device does not send
+continuos x/y axis position updates, a behavior also observed on its
+successor model, the Lenovo x230 which has the same firmware version. If the
+above property is set, libinput adjusts its behavior to better suit this
+particular model.
+The touchpad firmware version cannot be detected automatically by libinput,
+local configuration is required to set this property. Refer to the libinput
+model quirks hwdb for instructions.
+This property must not be used for any other purpose, no specific behavior
+is guaranteed.