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Yinon Burgansky a12dc6eba3 filter: differentiate scroll wheel from button scrolling to fix wheel speed 
Commit 94b7836456 ("filter: support accelerating high-resolution
scroll wheel events") introduced a regression where high-res scroll
wheel events were incorrectly normalized by DPI. Mice with non-default
DPI (e.g., Logitech G502 at 2400 DPI) had their scroll wheel speed
reduced by the DPI ratio (1000/2400), resulting in 2-3x slower
scrolling.

The "noop" filter functions were actually performing DPI normalization
or applying a constant acceleration factor, which is appropriate for
button scrolling but incorrect for scroll wheels that have their own
units.

Add a filter_scroll_type enum (CONTINOUS, WHEEL, FINGER to match the
public events) passed through the filter_scroll interface. Update all
filter implementations to skip acceleration and normalization for wheel
events while maintaining existing behavior for button scrolling and
touchpad scrolling.

The custom acceleration profile continues to accelerate high-res wheel
events as designed.

Fixes: 94b7836456 ("filter: support accelerating high-resolution scroll wheel events")

Closes: #1212

Signed-off-by: Yinon Burgansky <yinonburgansky@gmail.com>
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1363>
2025-11-11 14:43:41 +10:00
.gitlab/issue_templates gitlab: make the bug template the default template 2023-11-23 09:53:09 +10:00
.gitlab-ci CI: bump to Fedora 43 and Ubuntu 25.10 2025-11-07 15:13:08 +00:00
completion/zsh Add a public plugin system to libinput 2025-08-01 15:38:39 +10:00
doc doc: fix gitlab remote url 2025-11-08 15:02:59 +11:00
include Remove trailing whitespaces in the tree 2022-11-25 10:08:20 +10:00
plugins plugins: add an example for using a wheel to trigger button scrolling 2025-11-06 23:18:43 +00:00
quirks quirks: add quirk for MX Master 4 2025-11-09 00:09:47 +00:00
src filter: differentiate scroll wheel from button scrolling to fix wheel speed 2025-11-11 14:43:41 +10:00
test Fix clang-tidy false positives 2025-11-06 23:31:27 +00:00
tools tools: add support for NO_COLOR/FORCE_COLOR 2025-10-27 12:35:44 +10:00
udev meson.build: change from config.set10() and #if to config.set() and #ifdef 2025-07-28 12:04:09 +10:00
.clang-format clang-format: add litest_with_logcapture to foreach macros 2025-08-01 04:02:56 +00:00
.clang-format-ignore Add a clang-format file for consistent code formatting 2025-07-01 16:42:44 +10:00
.clang-tidy clang-tidy: fix WarningAsErrors option to actually work 2025-08-11 15:27:35 +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 CI: bump to Fedora 43 and Ubuntu 25.10 2025-11-07 15:13:08 +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: add a bugbot hook for re-closing a bug 2025-10-13 06:21:26 +00:00
.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 meson.build: fix indentation for the python files 2025-11-06 23:46:42 +00:00
meson_options.txt plugins: add meson option to autoload plugins 2025-10-31 05:25:29 +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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