F22 System Wide Change: Change xorg input stack to use libinput

[Jaroslav Reznik]

= Proposed System Wide Change: Change xorg input stack to use libinput =
https://fedoraproject.org/wiki/Changes/LibinputForXorg

Change owner(s): Hans de Goede <hdegoede at redhat.com>

Replace the current (low-level) input xorg drivers with libinput using the 
xorg-x11-drv-libinput wrapper. 

== Detailed Description ==
Currently xorg uses different input drivers depending on the device type. This 
makes it impossible to do things like middle button scrolling on the 
trackpoint on laptops where the trackpoint buttons are software-emulated 
buttons on the touchpad. Besides this the xf86-input-synaptics driver was 
never really designed for multi-touch touchpads and this causes various 
issues.

For Wayland we've been working on a new improved input stack, which is to be 
shared by all compositors and lives inside libinput. We plan to replace the 
current (low-level) input xorg drivers with libinput using the xorg-x11-drv-
libinput wrapper. 

== Scope ==
Besides xorg changes, this will also require changes to the control panel 
applets for mouse / touchpad configuration in the various desktop environments, 
as those all are hardcoded to use the xorg-x11-drv-synaptics specific 
interfaces.

* Proposal owners:
Package libinput and xorg-drv-input-libinput (done), make sure that xorg-drv-
input-libinput has the necessary config interfaces for control panel 
mouse/touchpad config applets (wip). Write patches for gnome-control-center 
mouse/touchpad capplet. Coordinate with other desktop environments.

* Other developers:
GNOME: merge the gnome-control-center patches. KDE: limits itself to standard 
X11 mouse config interfaces, no changes needed. Other Desktop Environments: 
adjust control-panel code to deal with xorg-x11-drv-libinput, merge these 
changes.

* Release engineering: N/A
* Policies and guidelines: N/A