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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Proposal for libinput mouse wheel acceleration"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101141">101141</a>
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<th>Summary</th>
<td>Proposal for libinput mouse wheel acceleration
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<th>Product</th>
<td>Wayland
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>libinput
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<th>Assignee</th>
<td>wayland-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>adam@spicenitz.org
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<p>
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<pre>Let me start with this proposal for mouse wheel acceleration in libinput.
Use case:
- Scrolling through a long document is slow with a mouse wheel
Prior work showing benefits of wheel acceleration:
- macOS
- Chrome OS
Requirements:
- Don't break anything
- Require minimum changes from clients
Proposal:
- Mouse wheel acceleration at the libinput level, only for mouse wheels
- Do no acceleration on values returned from
libinput_event_pointer_get_axis_value_discrete, this keeps the promise in the
API of reporting "physical mouse wheel clicks" and keeps us from needing to
implement a new "get unaccelerated" API
- Ensure that legacy X wheel events (pre-XI2.1) are not accelerated
Open questions:
- Does this cover enough clients without breaking things? Chrome and Firefox
support XI2.1, so this would accelerate those programs.
- Under X or XWayland, is it possible to accelerate XI2.1 events but not the
legacy events? Or are the legacy events generated automatically?
- Or is it ok to accelerate legacy X wheel events? emacs has scroll
acceleration already, and other clients may as well.</pre>
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