NAME

       libinput-debug-gui - visual debug helper for libinput

SYNOPSIS

       libinput debug-gui [options]

       libinput debug-gui [options] --udev <seat>

       libinput debug-gui [options] [--device] /dev/input/event0

DESCRIPTION

       The  libinput  debug-gui tool creates a libinput context and a full-screen GTK window to visualize events
       processed by libinput. This tool exclusively grabs pointing devices and stops them from interacting  with
       the rest of the GUI.

       Hit Esc to exit this tool.

       This  is  a debugging tool only, its output or behavior may change at any time. Do not rely on the output
       or the behavior.

       This tool usually needs to be run as root to have access to the /dev/input/eventX nodes.

OPTIONS

       --device /dev/input/event0
               Use the given device with the path backend. The --device argument may be omitted.

       --grab  Exclusively grab all opened devices. This will prevent events from being delivered  to  the  host
               system.

       --help  Print help

       --udev <seat>
               Use  the udev backend to listen for device notifications on the given seat.  The default behavior
               is equivalent to --udev "seat0".

       --verbose
               Use verbose output

       For libinput configuration options, see libinput-debug-events(1)

FEATURES

       Cursor movement
               The cursor is displayed as black triangle. Various markers are displayed in light  grey  to  help
               debug cusor positioning. The cursor movement is the one as seen by libinput and may not match the
               cursor movement of the display server.

       The unaccelerated cusor motion is displayed as a grey upside-down triangle.  The movement of this  cursor
       typically  reflects the relative motion in device units and can differ significantly to the normal cursor
       movement.

       The unaccelerated cursor motion is also displayed as a yellow snake. This is the connected set of  recent
       deltas. Unlike the unaccelerated cursor, these coordinates are not clipped to the window.

       Button testing
               Four  oblongs  are displayed at the bottom. The top three are left, middle, right, the bottom one
               is for any other button and displays the button name on press.

       Scrolling
               The green oblongs show the scrolling in continuous space, the  smaller  red  oblongs  the  scroll
               steps in discrete steps.

       Gestures
               A  set  of  four  horizontal black rings show swipe gestures, with the number of detected fingers
               filled in. A set of two black rings show pinch gestures, filled when events are detected.

       Touch and absolute mouse events
               Touch and absolute mouse events are displayed as red and blue circles, respectively, at the touch
               point or absolute position.

       Tablet tools
               Events  from tablet tools show a cyan square at the proximity-in and proximity-out positions. The
               tool position is shown as circle and increases in radius with increasing  pressure  or  distance.
               Pressure  and  distance  are  also  shown in the vertical bar south-east of center. Where tilt is
               available, the circle changes to an ellipsis to indicate the tilt angle.   Relative  events  from
               the tablet tool are displayed as a yellow snake, always starting from the center of the window on
               proximity in. Button events are displayed in the bottom-most button oblong, with the name of  the
               button displayed on press.

       Tablet pads
               Button  events  are  displayed  in  the  bottom-most  button  oblong, with the name of the button
               displayed on press. Ring and strip events are displayed in  the  yellow  'IO'  symbol,  with  the
               position and the number of the ring/strip filled in when events are available.

       Kernel events
               Left of the center is a blue ring to debug kernel relative events (REL_X and REL_Y). Each unit is
               displayed as one arrow in the respective direction.   Right  of  the  center  is  a  blue  oblong
               representing  the  most  recently-used  touch device. Touch events are displayed as they are read
               from the kernel.

NOTES

       Events shown by this tool may not correspond to the events seen by a different  user  of  libinput.  This
       tool initializes a separate context.

LIBINPUT

       Part of the libinput(1) suite