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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Fix 3 buttons tap for Synaptics devices since kernel 4.0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91352">91352</a>
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<th>Summary</th>
<td>Fix 3 buttons tap for Synaptics devices since kernel 4.0
</td>
</tr>
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<th>Product</th>
<td>Wayland
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>libinput
</td>
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<th>Assignee</th>
<td>wayland-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>benjamin.tissoires@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Kernel 4.0 introduced a different processing for Synaptics PS/2 devices:
<a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/input/mouse/synaptics.c?id=e9e8520f229bd6881b51d03c010df6c0312bfef8">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/input/mouse/synaptics.c?id=e9e8520f229bd6881b51d03c010df6c0312bfef8</a>
This commit introduced a different behavior when dropping a third finger on the
sensor (see also <a href="https://lkml.org/lkml/2015/6/11/487">https://lkml.org/lkml/2015/6/11/487</a>):
When we have 2 fingers and when we drop a third, the sequence is the following:
(slot 0 contains a touch in 200,2000 and slot 1 an other in 3000,3000):
ABS_MT_SLOT 0
ABS_MT_POSITION_X 4000
ABS_MT_POSITION_Y 4000
ABS_MT_PRESSURE 78
ABS_MT_SLOT 1
ABS_MT_TRACKING_ID -1
ABS_X 4000
ABS_Y 4000
ABS_PRESSURE 78
BTN_TOOL_DOUBLETAP 0
BTN_TOOL_TRIPLETAP 1
--- SYN_REPORT (0) ----------
ABS_MT_SLOT 0
ABS_MT_POSITION_X 4000
ABS_MT_POSITION_Y 4000
ABS_MT_PRESSURE 78
ABS_MT_SLOT 1
ABS_MT_TRACKING_ID 55
ABS_MT_POSITION_X 2000
ABS_MT_POSITION_Y 2000
ABS_MT_PRESSURE 72
ABS_X 4000
ABS_Y 4000
ABS_PRESSURE 78
--- SYN_REPORT (0) ----------
----- 3 fingers release -----
--- SYN_REPORT (0) ----------
ABS_MT_SLOT 0
ABS_MT_TRACKING_ID -1
ABS_MT_SLOT 1
ABS_MT_TRACKING_ID -1
BTN_TOUCH 0
ABS_PRESSURE 0
BTN_TOOL_TRIPLETAP 0
--- SYN_REPORT (0) ----------
We thus get a slot release when BTN_TOOL_TRIPLETAP is set to one.
For Synaptics devices reporting in PS/2 mode, we should have a special case
where we ignore the release of the slot when TRIPLETAP is set and DOUBLETAP is
unset.</pre>
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