Provided by: xserver-xorg-input-libinput_1.4.0-1build1_amd64 
NAME
libinput - libinput-based X.Org input driver
SYNOPSIS
Section "InputDevice"
Identifier "devname"
Driver "libinput"
Option "Device" "devpath"
...
EndSection
NOTE
This is the man page for the X input driver. If you are looking for the library
documentation, go to http://wayland.freedesktop.org/libinput/doc/
DESCRIPTION
libinput is an Xorg input driver based on libinput. It therefore supports all input
devices that libinput can handle, including most mice, keyboards, tablets and
touchscreens.
It is recommended that libinput devices are configured through the InputClass directive
(refer to xorg.conf(5)) instead of manual per-device configuration. Devices configured in
the xorg.conf(5) are not hot-plug capable.
CONFIGURATION DETAILS
Please refer to xorg.conf(5) for general configuration details and for options that can be
used with all input drivers. This section only covers configuration details specific to
this driver.
The following driver Options are supported:
Option "AccelProfile" "string"
Sets the pointer acceleration profile to the given profile. Permitted values are
adaptive, flat, custom. Not all devices support this option or all profiles. If a
profile is unsupported, the default profile for this device is used. For a
description on the profiles and their behavior, see the libinput documentation.
Option "AccelSpeed" "float"
Sets the pointer acceleration speed within the range [-1, 1]. This only applies to
the flat or adaptive profile.
Option "AccelPointsFallback" "string"
Option "AccelPointsMotion" "string"
Option "AccelPointsScroll" "string"
Sets the points of the Fallback/Motion/Scroll acceleration functions. The string
must be a space-separated list of floating point non-negative numbers, e.g. "0.0
1.0 2.4 2.5". This only applies to the custom profile. See section CUSTOM
ACCELERATION PROFILE
Option "AccelStepFallback" "float"
Option "AccelStepMotion" "float"
Option "AccelStepScroll" "float"
Sets the step between the points of the Fallback/Motion/Scroll acceleration
functions. When a step of 0.0 is provided, libinput's Fallback acceleration
function is used. This only applies to the custom profile. See section CUSTOM
ACCELERATION PROFILE
Option "ButtonMapping" "string"
Sets the logical button mapping for this device, see XSetPointerMapping(3). The
string must be a space-separated list of button mappings in the order of the
logical buttons on the device, starting with button 1. The default mapping is "1 2
3 ... 32". A mapping of 0 deactivates the button. Multiple buttons can have the
same mapping. Invalid mapping strings are discarded and the default mapping is
used for all buttons. Buttons not specified in the user's mapping use the default
mapping. See section BUTTON MAPPING for more details.
Option "CalibrationMatrix" "string"
A string of 9 space-separated floating point numbers, in the order "a b c d e f g h
i". Sets the calibration matrix to the 3x3 matrix where the first row is (abc),
the second row is (def) and the third row is (ghi).
Option "ClickMethod" "string"
Enables a click method. Permitted values are none, buttonareas, clickfinger. Not
all devices support all methods, if an option is unsupported, the default click
method for this device is used.
Option "DisableWhileTyping" "bool"
Indicates if the touchpad should be disabled while typing on the keyboard (this
does not apply to modifier keys such as Ctrl or Alt).
Option "Device" "string"
Specifies the device through which the device can be accessed. This will generally
be of the form "/dev/input/eventX", where X is some integer. When using InputClass
directives, this option is set by the server. The mapping from device node to
hardware is system-dependent. Property: "Device Node" (read-only).
Option "DragLockButtons" "L1 B1 L2 B2 ..."
Sets "drag lock buttons" that simulate a button logically down even when it has
been physically released. To logically release a locked button, a second click of
the same button is required.
If the option is a single button number, that button acts as the "meta" locking
button for the next button number. See section BUTTON DRAG LOCK for details.
If the option is a list of button number pairs, the first number of each number
pair is the lock button, the second number the logical button number to be locked.
See section BUTTON DRAG LOCK for details.
For both meta and button pair configuration, the button numbers are device button
numbers, i.e. the ButtonMapping applies after drag lock.
Option "HighResolutionWheelScrolling" "bool"
Disables high-resolution wheel scroll events, enabled by default. When enabled, the
driver forwards only high-resolution wheel scroll events from libinput. When
disabled, the driver forwards legacy wheel scroll events instead.
Option "HorizontalScrolling" "bool"
Enables or disables horizontal scrolling. When disabled, this driver will discard
any horizontal scroll events from libinput. This does not disable horizontal scroll
events from libinput; it merely discards the horizontal axis from any scroll
events. Default is enabled.
Option "LeftHanded" "bool"
Enables left-handed button orientation, i.e. swapping left and right buttons.
Option "MiddleEmulation" "bool"
Enables middle button emulation. When enabled, pressing the left and right buttons
simultaneously produces a middle mouse button click.
Option "NaturalScrolling" "bool"
Enables or disables natural scrolling behavior.
Option "RotationAngle" "float"
Sets the rotation angle of the device to the given angle, in degrees clockwise. The
angle must be between 0.0 (inclusive) and 360.0 (exclusive).
Option "ScrollButton" "int"
Designates a button as scroll button. If the ScrollMethod is button and the button
is logically down, x/y axis movement is converted into scroll events.
Option "ScrollButtonLock" "bool"
Enables or disables the scroll button lock. If enabled, the ScrollButton is
considered logically down after the first click and remains down until the second
click of that button. If disabled (the default), the ScrollButton button is
considered logically down while held down and up once physically released.
Option "ScrollMethod" "string"
Enables a scroll method. Permitted values are none, twofinger, edge, button. Not
all devices support all options, if an option is unsupported, the default scroll
option for this device is used.
Option "ScrollPixelDistance" "int"
Sets the movement distance, in "pixels", required to trigger one logical wheel
click. This option only applies to the scroll methods twofinger, edge, button. See
section SCROLL PIXEL DISTANCE for more details.
Option "SendEventsMode" "(disabled|enabled|disabled-on-external-mouse)"
Sets the send events mode to disabled, enabled, or "disable when an external mouse
is connected".
Option "TabletToolPressureCurve" "x0/y0 x1/y1 x2/y2 x3/y3"
Set the pressure curve for a tablet stylus to the bezier formed by the four points.
The respective x/y coordinate must be in the [0.0, 1.0] range. For more information
see section TABLET STYLUS PRESSURE CURVE.
Option "TabletToolAreaRatio" "w:h"
Sets the area ratio for a tablet tool. The area always starts at the origin (0/0)
and expands to the largest available area with the specified aspect ratio. Events
outside this area are cropped to the area. The special value "default" is used for
the default mapping (i.e. the device-native mapping). For more information see
section TABLET TOOL AREA RATIO.
Option "Tapping" "bool"
Enables or disables tap-to-click behavior.
Option "TappingButtonMap" "(lrm|lmr)"
Set the button mapping for 1/2/3-finger taps to left/right/middle or
left/middle/right, respectively.
Option "TappingDrag" "bool"
Enables or disables drag during tapping behavior ("tap-and-drag"). When enabled, a
tap followed by a finger held down causes a single button down only, all motions of
that finger thus translate into dragging motion. Tap-and-drag requires option
Tapping to be enabled.
Option "TappingDragLock" "bool"
Enables or disables drag lock during tapping behavior. When enabled, a finger up
during tap-and-drag will not immediately release the button. If the finger is set
down again within the timeout, the dragging process continues.
For all options, the options are only parsed if the device supports that configuration
option. For all options, the default value is the one used by libinput. On configuration
failure, the default value is applied.
SUPPORTED PROPERTIES
libinput exports runtime-configurable options as properties. If a property listed below is
not available, the matching configuration option is not available on the device. This
however does not imply that the feature is not available on the device. The following
properties are provided by the libinput driver.
libinput Accel Profiles Available
3 boolean values (8 bit, 0 or 1), in order "adaptive", "flat", "custom". Indicates
which acceleration profiles are available on this device.
libinput Accel Profile Enabled
3 boolean values (8 bit, 0 or 1), in order "adaptive", "flat", "custom". Indicates
which acceleration profile is currently enabled on this device.
libinput Accel Speed
1 32-bit float value, defines the pointer speed. Value range -1, 1. This only
applies to the flat or adaptive profile.
libinput Accel Custom Fallback Points
libinput Accel Custom Motion Points
libinput Accel Custom Scroll Points
A space-separated list of 32-bit floating point non-negative numbers, e.g. "0.0
1.0 2.4 2.5". Sets the points of the Fallback/Motion/Scroll acceleration
functions. This only applies to the custom profile. See section CUSTOM
ACCELERATION PROFILE
libinput Accel Custom Fallback Step
libinput Accel Custom Motion Step
libinput Accel Custom Scroll Step
1 32-bit float value, sets the step between the points of the
Fallback/Motion/Scroll acceleration functions. When a step of 0.0 is provided,
libinput's Fallback acceleration function is used. This only applies to the custom
profile. See section CUSTOM ACCELERATION PROFILE
libinput Button Scrolling Button
1 32-bit value. Sets the button number to use for button scrolling. This setting is
independent of the scroll method, to enable button scrolling the method must be set
to button-scrolling and a valid button must be set.
libinput Button Scrolling Button Lock Enabled
1 boolean value. If true, the scroll button lock is enabled. This setting is
independent of the scroll method or the scroll button, to enable button scrolling
the method must be set to button-scrolling and a valid button must be set.
libinput Calibration Matrix
9 32-bit float values, representing a 3x3 calibration matrix, order is row 1, row
2, row 3
libinput Click Methods Available
2 boolean values (8 bit, 0 or 1), in order "buttonareas", "clickfinger". Indicates
which click methods are available on this device.
libinput Click Methods Enabled
2 boolean values (8 bit, 0 or 1), in order "buttonareas", "clickfinger". Indicates
which click methods are enabled on this device.
libinput Drag Lock Buttons
Either one 8-bit value specifying the meta drag lock button, or a list of button
pairs. See section BUTTON DRAG LOCK for details.
libinput High Resolution Wheel Scroll Enabled
1 boolean value (8 bit, 0 or 1). Indicates whether high-resolution wheel scroll
events are enabled or not.
libinput Horizontal Scroll Enabled
1 boolean value (8 bit, 0 or 1). Indicates whether horizontal scrolling events are
enabled or not.
libinput Left Handed Enabled
1 boolean value (8 bit, 0 or 1). Indicates if left-handed mode is enabled or
disabled.
libinput Middle Emulation Enabled
1 boolean value (8 bit, 0 or 1). Indicates if middle emulation is enabled or
disabled.
libinput Natural Scrolling Enabled
1 boolean value (8 bit, 0 or 1). 1 enables natural scrolling
libinput Rotation Angle
1 32-bit float value [0.0 to 360.0). Sets the rotation angle of the device,
clockwise of its natural neutral position.
libinput Scroll Methods Available
3 boolean values (8 bit, 0 or 1), in order "two-finger", "edge", "button".
Indicates which scroll methods are available on this device.
libinput Scroll Method Enabled
3 boolean values (8 bit, 0 or 1), in order "two-finger", "edge", "button".
Indicates which scroll method is currently enabled on this device.
libinput Scroll Pixel Distance
1 32-bit value (nonzero, with additional implementation-defined range checks).
Changes the movement distance required to trigger one logical wheel click.
libinput Send Events Modes Available
2 boolean values (8 bit, 0 or 1), in order "disabled" and "disabled-on-external-
mouse". Indicates which send-event modes are available on this device.
libinput Send Events Mode Enabled
2 boolean values (8 bit, 0 or 1), in order "disabled" and "disabled-on-external-
mouse". Indicates which send-event modes is currently enabled on this device.
libinput Tablet Tool Pressurecurve
4 32-bit float values [0.0 to 1.0]. See section TABLET TOOL PRESSURE CURVE
libinput Tablet Tool Area Ratio
2 32-bit values, corresponding to width and height. Special value 0, 0 resets to
the default ratio. See section TABLET TOOL AREA RATIO for more information.
libinput Tapping Enabled
1 boolean value (8 bit, 0 or 1). 1 enables tapping
libinput Tapping Button Mapping Enabled
2 boolean value (8 bit, 0 or 1), in order "lrm" and "lmr". Indicates which button
mapping is currently enabled on this device.
libinput Tapping Drag Lock Enabled
1 boolean value (8 bit, 0 or 1). 1 enables drag lock during tapping
libinput Disable While Typing Enabled
1 boolean value (8 bit, 0 or 1). Indicates if disable while typing is enabled or
disabled.
Most properties have a libinput <property name> Default equivalent that indicates the
default value for this setting on this device.
BUTTON MAPPING
X clients receive events with logical button numbers, where 1, 2, 3 are usually
interpreted as left, middle, right and logical buttons 4, 5, 6, 7 are usually interpreted
as scroll up, down, left, right. The fourth and fifth physical buttons on a device will
thus send logical buttons 8 and 9. The ButtonMapping option adjusts the logical button
mapping, it does not affect how a physical button is mapped to a logical button.
Traditionally, a device was set to left-handed button mode by applying a button mapping of
"3 2 1 ..." On systems using the libinput Xorg input driver it is recommended to use the
LeftHanded option instead.
The libinput Xorg input driver does not use the button mapping after setup. Use
XSetPointerMapping(3) to modify the button mapping at runtime.
BUTTON DRAG LOCK
Button drag lock holds a button logically down even when the button itself has been
physically released since. Button drag lock comes in two modes.
If in "meta" mode, a meta button click activates drag lock for the next button press of
any other button. A button click in the future will keep that button held logically down
until a subsequent click of that same button. The meta button events themselves are
discarded. A separate meta button click is required each time a drag lock should be
activated for a button in the future.
If in "pairs" mode, each button can be assigned a target locking button. On button click,
the target lock button is held logically down until the next click of the same button. The
button events themselves are discarded and only the target button events are sent.
This feature is provided by this driver, not by libinput.
TABLET TOOL PRESSURECURVE
The pressure curve affects how stylus pressure is reported. By default, the hardware
pressure is reported as-is. By setting a pressure curve, the feel of the stylus can be
adjusted to be more like e.g. a pencil or a brush.
The pressure curve is a cubic Bezier curve, drawn within a normalized range of 0.0 to 1.0
between the four points provided. This normalized range is applied to the tablet's
pressure input so that the highest pressure maps to 1.0. The points must have increasing x
coordinates, if x0 is larger than 0.0 all pressure values lower than x0 are equivalent to
y0. If x3 is less than 1.0, all pressure values higher than x3 are equivalent to y3.
The input for a linear curve (default) is "0.0/0.0 0.0/0.0 1.0/1.0 1.0/1.0"; a slightly
depressed curve (firmer) might be "0.0/0.0 0.05/0.0 1.0/0.95 1.0/1.0"; a slightly raised
curve (softer) might be "0.0/0.0 0.0/0.05 0.95/1.0 1.0/1.0".
This feature is provided by this driver, not by libinput.
TABLET TOOL AREA RATIO
By default, a tablet tool can access the whole sensor area and the tablet area is mapped
to the available screen area. For external tablets like the Wacom Intuos series, the
height:width ratio of the tablet may be different to that of the monitor, causing the skew
of input data.
To avoid this skew of input data, an area ratio may be set to match the ratio of the
screen device. For example, a ratio of 4:3 will reduce the available area of the tablet to
the largest available area with a ratio of 4:3. Events within this area will scale to the
tablet's announced axis range, the area ratio is thus transparent to the X server. Any
events outside this area will send events equal to the maximum value of that axis. The
area always starts at the device's origin in it's current rotation, i.e. it takes left-
handed-ness into account.
This feature is provided by this driver, not by libinput.
SCROLL PIXEL DISTANCE
The X server does not support per-pixel scrolling but it does support smooth scrolling.
All scroll events however are based around a logical unit of scrolling (traditionally
corresponding to a wheel click). It is thus not possible to scroll by 10 pixels, but it
is possible for a driver to scroll by 1/10th of a logical wheel click.
libinput provides scroll data in pixels. The ScrollPixelDistance option defines the amount
of movement equivalent to one wheel click. For example, a value of 50 means the user has
to move a finger by 50 pixels to generate one logical click event and each pixel is 1/50th
of a wheel click.
CUSTOM ACCELERATION PROFILE
The custom pointer acceleration profile gives users full control over the acceleration
behavior at different speeds. libinput exposes an acceleration function f(x) where the x-
axis is the device speed in device units per millisecond and the y-axis is the pointer
speed.
The custom acceleration function is defined using n points which are spaced uniformly
along the x-axis, starting from 0 and continuing in constant steps. Thus the points
defining the custom function are:
(0 * step, f[0]), (1 * step, f[1]), ..., ((n-1) * step, f[n-1])
When a velocity value does not lie exactly on those points, a linear
interpolation/extrapolation of the two closest points will be calculated.
There are 3 custom acceleration function, which are used for different movement types:
┌──────────────┬──────────────────────────────────┬──────────────────┐
│Movement type │ Uses │ supported by │
├──────────────┼──────────────────────────────────┼──────────────────┤
│Fallback │ Catch-all default movement type │ All devices │
├──────────────┼──────────────────────────────────┼──────────────────┤
│Motion │ Used for pointer motion │ All devices │
├──────────────┼──────────────────────────────────┼──────────────────┤
│Scroll │ Used for scroll movement │ Mouse, Touchpad │
└──────────────┴──────────────────────────────────┴──────────────────┘
See libinput library documentation of more details:
https://wayland.freedesktop.org/libinput/doc/latest/pointer-acceleration.html#the-custom-
acceleration-profile
BUGS
This driver does not work with Option "Device" set to an event node in /dev/input/by-id
and /dev/input/by-path. This can be usually be worked by using Section "InputClass" with
an appropriate Match* statement in the xorg.conf(5).
AUTHORS
Peter Hutterer
SEE ALSO
Xorg(1), xorg.conf(5), Xserver(1), X(7)