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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Two finger scroll stuck/not happening"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105094">105094</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Two finger scroll stuck/not happening
</td>
</tr>
<tr>
<th>Product</th>
<td>Wayland
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>libinput
</td>
</tr>
<tr>
<th>Assignee</th>
<td>wayland-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eyenseo@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=137358" name="attach_137358" title="evemu recording">attachment 137358</a> <a href="attachment.cgi?id=137358&action=edit" title="evemu recording">[details]</a></span>
evemu recording
I noticed today that there is a issue with two finger scrolling.
"Sometimes" I start to scroll with two fingers and nothing happens. If I then
use only one finger (either by lifting one or lifting both and then touching
only with one again) I will scroll. The only way to 'unstuck' the scrolling is
to click.
I am not sure which version introduced this behavior and I wasn't able to
playback the recording. Further I'm not sure if this is indeed a bug in
libinput or was introduced by the kernel but since the debug output showed what
I was experiencing I filed the bug here.
debug-events:
...
event17 POINTER_MOTION +70.55s -30.54/ 0.00
event17 POINTER_MOTION +70.56s -19.44/ 0.00
event17 POINTER_MOTION +70.58s -6.94/ 0.00
event17 GESTURE_SWIPE_BEGIN +71.06s 3
event17 GESTURE_SWIPE_UPDATE +71.06s 3 0.00/ 1.18 ( 0.00/ 3.58
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.08s 3 -0.21/ 0.80 (-1.41/ 5.37
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.10s 3 0.00/ 2.02 ( 0.00/10.74
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.12s 3 -1.29/11.70 (-3.75/34.00
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.14s 3 0.00/17.89 ( 0.00/48.32
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.16s 3 -1.39/15.90 (-3.75/42.95
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.18s 3 -2.08/11.26 (-5.62/30.42
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.20s 3 -1.39/ 5.96 (-3.75/16.11
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.22s 3 -1.39/ 1.99 (-3.75/ 5.37
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.26s 3 -0.63/ 0.00 (-1.87/ 0.00
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.28s 3 0.00/-22.13 ( 0.00/-66.21
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.30s 3 0.00/-14.58 ( 0.00/-39.37
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.32s 3 0.00/-6.63 ( 0.00/-17.90
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.34s 3 0.00/-2.65 ( 0.00/-7.16
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.36s 3 0.00/-1.33 ( 0.00/-3.58
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.38s 3 0.00/-1.33 ( 0.00/-3.58
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.40s 3 0.00/-0.66 ( 0.00/-1.79
unaccelerated)
event17 GESTURE_SWIPE_UPDATE +71.42s 3 0.00/-0.66 ( 0.00/-1.79
unaccelerated)
event17 GESTURE_SWIPE_END +71.62s 3 cancelled
event17 POINTER_AXIS +71.83s vert -20.54* horiz 3.82* (finger)
event17 POINTER_AXIS +71.85s vert -27.17* horiz 10.41* (finger)
event17 POINTER_AXIS +71.87s vert -24.52* horiz 11.11* (finger)
event17 POINTER_AXIS +71.89s vert -15.90* horiz 6.94* (finger)
event17 POINTER_AXIS +71.91s vert -5.96* horiz 2.78* (finger)
event17 POINTER_AXIS +71.93s vert -1.33* horiz 1.39* (finger)
...
-event17 POINTER_BUTTON +75.24s BTN_LEFT (272) pressed, seat count: 1
event17 POINTER_BUTTON +75.34s BTN_LEFT (272) released, seat count:
0
event17 POINTER_MOTION +76.07s 0.00/ -1.81
event17 POINTER_MOTION +76.09s 0.00/-20.53
event17 POINTER_MOTION +76.11s 0.00/-26.51
The POINTER_AXIS motions result in the unwanted scrolling effect and stay until
the POINTER_MOTION click happens.
I'm on arch linux;
libinput 1.9.4-1
libinput-git 1.10.0.r9.g582e3c00
linux 4.15.3-1
linux-ck-haswell 4.14.18-1
linux-ck-haswell 4.14.19-1
udevadm
P: /devices/platform/i8042/serio1/input/input14/event17
N: input/event17
S: input/by-path/platform-i8042-serio-1-event-mouse
E: DEVLINKS=/dev/input/by-path/platform-i8042-serio-1-event-mouse
E: DEVNAME=/dev/input/event17
E: DEVPATH=/devices/platform/i8042/serio1/input/input14/event17
E: ID_BUS=i8042
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=77
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=101
E: ID_PATH=platform-i8042-serio-1
E: ID_PATH_TAG=platform-i8042-serio-1
E: ID_SERIAL=noserial
E: LIBINPUT_DEVICE_GROUP=11/2/7:isa0060/serio1
E: LIBINPUT_MODEL_SYNAPTICS_SERIAL_TOUCHPAD=1
E: LIBINPUT_MODEL_TOUCHPAD_VISIBLE_MARKER=1
E: MAJOR=13
E: MINOR=81
E: SUBSYSTEM=input
E: USEC_INITIALIZED=4970735</pre>
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