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EVDEV(4) EVDEV(4)

NAME
evdev - Generic Linux input driver

SYNOPSIS
Section "InputDevice"
Identifier "devname"
Driver "evdev"
Option "Device" "devpath"
Option "Emulate3Buttons" "True"
Option "Emulate3Timeout" "50"
Option "GrabDevice" "False"
...
EndSection

DESCRIPTION
evdev is an Xorg input driver for Linux's generic event devices. It therefore supports all input devices that the kernel
knows about, including most mice, keyboards, tablets and touchscreens. evdev is the default driver on the major Linux
distributions.

The evdev driver can serve as both a pointer and a keyboard input device. Multiple input devices are supported by multi-
ple instances of this driver, with one InputDevice section of your xorg.conf for each input device that will use this
driver.

It is recommended that evdev 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.

SUPPORTED HARDWARE
In general, any input device that the kernel has a driver for can be accessed through the evdev driver. See the Linux
kernel documentation for a complete list.

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 "ButtonMapping" "string"
Sets the button mapping for this device. The mapping is a space-separated list of button mappings that correspond
in order to the physical buttons on the device (i.e. the first number is the mapping for button 1, etc.). The
default mapping is "1 2 3 ... 32". A mapping of 0 deactivates the button. Multiple buttons can have the same map-
ping. For example, a left-handed mouse with deactivated scroll-wheel would use a mapping of "3 2 1 0 0". Invalid
mappings are ignored and the default mapping is used. Buttons not specified in the user's mapping use the default
mapping.

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. The mapping from device node to hardware is system-dependent.

Option "DragLockButtons" "L1 B2 L3 B4"
Sets "drag lock buttons" that simulate holding a button down, so that low dexterity people do not have to hold a
button down at the same time they move a mouse cursor. Button numbers occur in pairs, with the lock button number
occurring first, followed by the button number that is the target of the lock button. Property: "Evdev Drag Lock
Buttons".

Option "DragLockButtons" "M1"
Sets a "master drag lock button" that acts as a "Meta Key" indicating that the next button pressed is to be "drag
locked". Property: "Evdev Drag Lock Buttons".

Option "Emulate3Buttons" "boolean"
Enable/disable the emulation of the third (middle) mouse button for mice which only have two physical but-
tons. The third button is emulated by pressing both buttons simultaneously. Default: off. Property:
"Evdev Middle Button Emulation".

Option "Emulate3Timeout" "integer"
Sets the timeout (in milliseconds) that the driver waits before deciding if two buttons where pressed
"simultaneously" when 3 button emulation is enabled. Default: 50. Property: "Evdev Middle Button Timeout".

Option "EmulateWheel" "boolean"
Enable/disable "wheel" emulation. Wheel emulation means emulating button press/release events when the
mouse is moved while a specific real button is pressed. Wheel button events (typically buttons 4 and 5)
are usually used for scrolling. Wheel emulation is useful for getting wheel-like behaviour with track-
balls. It can also be useful for mice with 4 or more buttons but no wheel. See the description of the
EmulateWheelButton, EmulateWheelInertia, EmulateWheelTimeout, XAxisMapping, and YAxisMapping options.
Default: off. Property "Evdev Wheel Emulation".

Option "EmulateWheelButton" "integer"
Specifies which button must be held down to enable wheel emulation mode. While this button is down, X
and/or Y pointer movement will generate button press/release events as specified for the XAxisMapping and
YAxisMapping settings. If the button is 0 and EmulateWheel is on, any motion of the device is converted
into wheel events. Default: 4. Property: "Evdev Wheel Emulation Button".

Option "EmulateWheelInertia" "integer"
Specifies how far (in pixels) the pointer must move to generate button press/release events in wheel emula-
tion mode. Default: 10. Property: "Evdev Wheel Emulation Inertia".

Option "EmulateWheelTimeout" "integer"
Specifies the time in milliseconds the EmulateWheelButton must be pressed before wheel emulation is
started. If the EmulateWheelButton is released before this timeout, the original button press/release event
is sent. Default: 200. Property: "Evdev Wheel Emulation Timeout".

Option "GrabDevice" "boolean"
Force a grab on the event device. Doing so will ensure that no other driver can initialise the same device
and it will also stop the device from sending events to /dev/kbd or /dev/input/mice. Events from this
device will not be sent to virtual devices (e.g. rfkill or the Macintosh mouse button emulation). Default:
disabled.

Option "InvertX" "Bool"

Option "InvertY" "Bool"
Invert the given axis. Default: off. Property: "Evdev Axis Inversion".

Option "IgnoreRelativeAxes" "Bool"

Option "IgnoreAbsoluteAxes" "Bool"
Ignore the specified type of axis. Default: unset. The X server cannot deal with devices that have both
relative and absolute axes. Evdev tries to guess wich axes to ignore given the device type and disables
absolute axes for mice and relative axes for tablets, touchscreens and touchpad. These options allow to
forcibly disable an axis type. Mouse wheel axes are exempt and will work even if relative axes are ignored.
No property, this configuration must be set in the configuration.
If either option is set to False, the driver will not ignore the specified axes regardless of the presence
of other axes. This may trigger buggy behavior and events from this axis are always forwarded. Users are
discouraged from setting this option.

Option "Calibration" "min-x max-x min-y max-y"
Calibrates the X and Y axes for devices that need to scale to a different coordinate system than reported
to the X server. This feature is required for devices that need to scale to a different coordinate system
than originally reported by the kernel (e.g. touchscreens). The scaling to the custom coordinate system is
done in-driver and the X server is unaware of the transformation. Property: "Evdev Axis Calibration".

Option "Mode" "Relative"|"Absolute"
Sets the mode of the device if device has absolute axes. The default value for touchpads is relative, for
other absolute. This option has no effect on devices without absolute axes.

Option "SwapAxes" "Bool"
Swap x/y axes. Default: off. Property: "Evdev Axes Swap".

Option "XAxisMapping" "N1 N2"
Specifies which buttons are mapped to motion in the X direction in wheel emulation mode. Button number N1
is mapped to the negative X axis motion and button number N2 is mapped to the positive X axis motion.
Default: no mapping. Property: "Evdev Wheel Emulation Axes".

Option "YAxisMapping" "N1 N2"
Specifies which buttons are mapped to motion in the Y direction in wheel emulation mode. Button number N1
is mapped to the negative Y axis motion and button number N2 is mapped to the positive Y axis motion.
Default: "4 5". Property: "Evdev Wheel Emulation Axes".

SUPPORTED PROPERTIES
The following properties are provided by the evdev driver.

Evdev Axis Calibration
4 32-bit values, order min-x, max-x, min-y, max-y or 0 values to disable in-driver axis calibration.

Evdev Axis Inversion
2 boolean values (8 bit, 0 or 1), order X, Y. 1 inverts the axis.

Evdev Axes Swap
1 boolean value (8 bit, 0 or 1). 1 swaps x/y axes.

Evdev Drag Lock Buttons
8-bit. Either 1 value or pairs of values. Value range 0-32, 0 disables a value.

Evdev Middle Button Emulation
1 boolean value (8 bit, 0 or 1).

Evdev Middle Button Timeout
1 16-bit positive value.

Evdev Wheel Emulation
1 boolean value (8 bit, 0 or 1).

Evdev Wheel Emulation Axes
4 8-bit values, order X up, X down, Y up, Y down. 0 disables a value.

Evdev Wheel Emulation Button
1 8-bit value, allowed range 0-32, 0 disables the button.

Evdev Wheel Emulation Inertia
1 16-bit positive value.

Evdev Wheel Emulation Timeout
1 16-bit positive value.

AUTHORS
Kristian Hogsberg, Peter Hutterer

SEE ALSO
Xorg(1), xorg.conf(5), Xserver(1), X(7)

X Version 11 xf86-input-evdev 2.5.0 EVDEV(4)