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Work on and concerns about libinput in Linux

Submitted by Roy Schestowitz on Thursday 17th of October 2019 02:41:18 AM Filed under
Linux
  • An update on the input stack

    The input stack for Linux is an essential part of interacting with our systems, but it is also an area that is lacking in terms of developers. There has been progress over the last few years, however; Peter Hutterer from Red Hat came to the 2019 X.Org Developers Conference to talk about some of the work that has been done. He gave a status report on the input stack that covered development work that is going on now as well as things that have been completed in the last two years or so. Overall, things are looking pretty good for input on Linux, though the "bus factor" for the stack is alarmingly low.

    High-resolution mouse scrolling

    High-resolution mouse-wheel scrolling should be arriving in the next month or two, he said. It allows for a different event stream that provides more precision on the movement of the mouse wheel on capable devices. Instead of one event per 15-20° of movement, the mouse will send two or four events in that span. Two new event types were added to the 5.0 kernel (REL_WHEEL_HI_RES and REL_HWHEEL_HI_RES) to support the feature. The old and new event streams may not correlate exactly, so they probably should not be used together, he cautioned.

    Likewise, libinput has added a new event type (LIBINPUT_EVENT_POINTER_AXIS_WHEEL) for high-resolution scrolling; it should be handled with its own event stream as with the kernel events. That code is sitting on a branch; it works but it has not been merged into the master yet. For Wayland, a new event type was also added in a now-familiar pattern. He pointed to a mailing list post where all the gory details of high-resolution scrolling for Wayland was explained.

  • A Vast Majority Of Linux's Input Improvements Are Developed By One Individual

    While there is an ever increasing number of open-source developers focusing on the Linux graphics stack with the GPU drivers and related infrastructure, it's quite a different story when it comes to the Linux input side. It's basically one developer that has been working on the Linux input improvements for the past number of years.

    [...]

    As he has pointed out, should anything ever happen to him the libinput library would be in bad shape. While there have been 76 contributors in total to libinput in the past two years, only 24 of them have had more than one commit while only six contributors have had more than five commits. One would just need around 50 commits to become the second-from-the-top contributor to the project.

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