https://bugs.freedesktop.org/show_bug.cgi?id=89949
Bug ID: 89949
Summary: Fake finger switching bug in edge scrolling and
tapping code
Product: Wayland
Version: unspecified
Hardware: Other
OS: All
Status: ASSIGNED
Severity: normal
Priority: medium
Component: libinput
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 114942
--> https://bugs.freedesktop.org/attachment.cgi?id=114942&action=edit
evemu recording
To switch from one to two fingers on a touchpad without slots, the event
sequence is:
BTN_TOOL_FINGER 0
BTN_TOOL_DOUBLETAP 1
SYN_REPORT
On those touchpads, all touches are fake touches (sort-of). The above sequence
will end the currently active touch and then re-start two new touches when the
DOUBLETAP is seen. This triggers a bug message in the edge scrolling code -
since there is no SYN_REPORT between the BTN_TOOL the touch is still in AREA
state when it is re-triggered as a TOUCH_BEGIN.
This also affects the tapping code.
The sequence attached is enough to trigger it, full sequence in the bug here:
https://bugzilla.redhat.com/show_bug.cgi?id=1209151
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