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Peter Hutterer 3ca34aa88a evdev: move the SYN_REPORT 1 filtering to the touchpad backend 
In commit 9a9466b6a9 ("evdev: discard any frame with EV_SYN SYN_REPORT 1")
all frames with a SYN_REPORT 1 were discarded on the assumption of those
being key repeat frames. Unfortunately the kernel uses the same sequence
to simply mark *any* injected/emulated event, regardless of the cause. Key repeat
events are merely the most numerous ones but as shown in commit
7140f13d82 ("evdev: track KEY_SYSRQ frames and pass them even as repeat frames")
Alt+PrintScreen is also an emulated event.

Issue #1165 details another case: keyboards with n-key rollover can
exceed the kernel-internal event buffer, typically 8 events for devices
without EV_REL/EV_ABS. Those events will be broken up by the kernel into
multiple frames - once nevents == buffer_size the current state is
flushed as SYN_REPORT 1 frame. Then, if any more events are pending
those are flushed as SYN_REPORT 0 frame. In the case of exactly 8
events, the second frame is never present, so we cannot easily detect if
another one is coming.

Issue #1145 only affects us in the touchpad code, the rest of the
backends seem to (so far) be fine. So let's move the discarding of
SYN_REPORT 1 to the touchpad backend and leave the rest of the code
as-is.

This effectively
Reverts: 7140f13d82 ("evdev: track KEY_SYSRQ frames and pass them even as repeat frames")
Reverts: 9a9466b6a9 ("evdev: discard any frame with EV_SYN SYN_REPORT 1")

Closes #1165

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1282>
2025-07-31 00:50:30 +00:00
.gitlab/issue_templates gitlab: make the bug template the default template 2023-11-23 09:53:09 +10:00
.gitlab-ci tools: add a debug-tablet-pad tool 2025-07-28 23:40:33 +00:00
completion/zsh zsh: add shell completion for the eraser button 2025-06-20 10:01:20 +10:00
doc doc/user: update architecture docs with the plugin pipeline 2025-06-27 04:11:40 +00:00
include Remove trailing whitespaces in the tree 2022-11-25 10:08:20 +10:00
quirks plugins: restore the wheel plugin specifically for the MX Master 3 2025-07-10 01:33:24 +00:00
src evdev: move the SYN_REPORT 1 filtering to the touchpad backend 2025-07-31 00:50:30 +00:00
test evdev: move the SYN_REPORT 1 filtering to the touchpad backend 2025-07-31 00:50:30 +00:00
tools tools: add missing AttrIsVirtual handling for listing quirks 2025-07-30 05:43:03 +00:00
udev meson.build: change from config.set10() and #if to config.set() and #ifdef 2025-07-28 12:04:09 +10:00
.clang-format Add a clang-format file for consistent code formatting 2025-07-01 16:42:44 +10:00
.clang-format-ignore Add a clang-format file for consistent code formatting 2025-07-01 16:42:44 +10:00
.clang-tidy util: add various helper functions to use __attribute__(cleanup) 2025-04-16 17:04:58 +10:00
.clang-tidy-ignore Add a clang-tidy file 2025-04-07 08:43:36 +00:00
.dir-locals.el indentation: add .dir-locals.el for emacs 2018-02-26 18:44:00 +10:00
.editorconfig editorconfig: add settings for sym files 2024-11-04 10:31:30 +00:00
.git-blame-ignore-revs git: add git-blame-ignore-revs to ignore the clang-format commits 2025-07-02 12:43:13 +10:00
.gitignore gitignore: ignore gnuplot files 2018-05-10 16:25:40 +10:00
.gitlab-ci.yml test: split some tablet tests into new groups 2025-07-17 00:16:02 +00:00
.pre-commit-config.yaml pre-commit: update the name for the ruff check 2025-07-15 16:24:27 +10:00
.triage-policies.yml triage-policies: update to handle a few more things in MRs as well 2025-02-03 09:16:02 +10:00
.vimdir Add .vimdir for libinput-specific settings 2015-05-25 09:17:29 +10:00
CODING_STYLE.md Drop the Signed-off-by requirement 2023-07-21 09:08:46 +10:00
CONTRIBUTING.md CONTRIBUTING: Add CONTRIBUTING.md 2024-02-28 17:07:45 +01:00
COPYING Change various references to the master branch to main 2021-04-29 01:31:03 +00:00
meson.build tools: add a debug-tablet-pad tool 2025-07-28 23:40:33 +00:00
meson_options.txt Move mtdev into a plugin 2025-07-02 06:53:05 +00:00
README.md Change various references to the master branch to main 2021-04-29 01:31:03 +00:00

README.md

libinput

libinput is a library that provides a full input stack for display servers and other applications that need to handle input devices provided by the kernel.

libinput provides device detection, event handling and abstraction to minimize the amount of custom input code the user of libinput needs to provide the common set of functionality that users expect. Input event processing includes scaling touch coordinates, generating relative pointer events from touchpads, pointer acceleration, etc.

User documentation

Documentation explaining features available in libinput is available here.

This includes the FAQ and the instructions on reporting bugs.

Source code

The source code of libinput can be found at: https://gitlab.freedesktop.org/libinput/libinput

For a list of current and past releases visit: https://www.freedesktop.org/wiki/Software/libinput/

Build instructions: https://wayland.freedesktop.org/libinput/doc/latest/building.html

Reporting Bugs

Bugs can be filed on freedesktop.org GitLab: https://gitlab.freedesktop.org/libinput/libinput/issues/

Where possible, please provide the libinput record output of the input device and/or the event sequence in question.

See https://wayland.freedesktop.org/libinput/doc/latest/reporting-bugs.html for more info.

Documentation

Examples of how to use libinput are the debugging tools in the libinput repository. Developers are encouraged to look at those tools for a real-world (yet simple) example on how to use libinput.

License

libinput is licensed under the MIT license.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: [...]

See the COPYING file for the full license information.

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