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LIBINPUT(4) Device Drivers Manual LIBINPUT(4)

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:

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.
Sets the pointer acceleration speed within the range [-1, 1]. This only applies to the flat or adaptive profile.
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
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
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.
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).
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.
Indicates if the touchpad should be disabled while typing on the keyboard (this does not apply to modifier keys such as Ctrl or Alt).
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).
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.
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.
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.
Enables left-handed button orientation, i.e. swapping left and right buttons.
Enables middle button emulation. When enabled, pressing the left and right buttons simultaneously produces a middle mouse button click.
Enables or disables natural scrolling behavior.
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).
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.
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.
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.
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.
Sets the send events mode to disabled, enabled, or "disable when an external mouse is connected".
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.
Set the pressure range for a tablet stylus to the given subset of the physical range. The min/max values must be in the [0.0, 1.0] range. For example a min of 0.3 means the tablet will send 0 pressure for anything equal or below 30% of the physical pressure range and a max of 0.7 means the tablet sends its maximum pressure value for any pressure equal or higher to 70% of the physical pressure range.
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.
Enables or disables tap-to-click behavior.
Set the button mapping for 1/2/3-finger taps to left/right/middle or left/middle/right, respectively.
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.
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.

3 boolean values (8 bit, 0 or 1), in order "adaptive", "flat", "custom". Indicates which acceleration profiles are available on this device.
3 boolean values (8 bit, 0 or 1), in order "adaptive", "flat", "custom". Indicates which acceleration profile is currently enabled on this device.
1 32-bit float value, defines the pointer speed. Value range -1, 1. This only applies to the flat or adaptive profile.
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
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
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.
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.
9 32-bit float values, representing a 3x3 calibration matrix, order is row 1, row 2, row 3
2 boolean values (8 bit, 0 or 1), in order "buttonareas", "clickfinger". Indicates which click methods are available on this device.
2 boolean values (8 bit, 0 or 1), in order "buttonareas", "clickfinger". Indicates which click methods are enabled on this device.
Either one 8-bit value specifying the meta drag lock button, or a list of button pairs. See section BUTTON DRAG LOCK for details.
1 boolean value (8 bit, 0 or 1). Indicates whether high-resolution wheel scroll events are enabled or not.
1 boolean value (8 bit, 0 or 1). Indicates whether horizontal scrolling events are enabled or not.
1 boolean value (8 bit, 0 or 1). Indicates if left-handed mode is enabled or disabled.
1 boolean value (8 bit, 0 or 1). Indicates if middle emulation is enabled or disabled.
1 boolean value (8 bit, 0 or 1). 1 enables natural scrolling
1 32-bit float value [0.0 to 360.0). Sets the rotation angle of the device, clockwise of its natural neutral position.
3 boolean values (8 bit, 0 or 1), in order "two-finger", "edge", "button". Indicates which scroll methods are available on this device.
3 boolean values (8 bit, 0 or 1), in order "two-finger", "edge", "button". Indicates which scroll method is currently enabled on this device.
1 32-bit value (nonzero, with additional implementation-defined range checks). Changes the movement distance required to trigger one logical wheel click.
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.
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.
4 32-bit float values [0.0 to 1.0]. See section TABLET TOOL PRESSURE CURVE
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.
1 boolean value (8 bit, 0 or 1). 1 enables tapping
2 boolean value (8 bit, 0 or 1), in order "lrm" and "lmr". Indicates which button mapping is currently enabled on this device.
1 boolean value (8 bit, 0 or 1). 1 enables drag lock during tapping
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.

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".

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.

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)

xf86-input-libinput 1.5.0