https://bugs.kde.org/show_bug.cgi?id=401477
Bug ID: 401477
Summary: Multi-screen Touchscreen Support
Product: plasmashell
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Multi-screen support
Assignee: aleix...@kde.org
Reporter: cr...@solarsells.co.za
CC: plasma-b...@kde.org
Target Milestone: 1.0
SUMMARY:
When using a external monitor with a touchscreen, the physical range of the
touchscreen input is mapped to the total pixel range of both monitors combined.
I have a 1920x1080 external monitor with a touchscreen extended to the left of
my 1366x768 laptop screen. When my finger is on the top left corner of the
external monitor, the mouse is under my finger (as it should be). However as I
move my finger to the right, the mouse accelerates in front of my finger. Once
my finger touches the right bezel, the mouse is at right most edge of my laptop
screen. Likewise this happens in the vertical axis, however the effect is
"clipped" when the mouse is on the laptop screen due to the resolution
difference and the top edge alignment.
I have tried this monitor on a windows machine and it does not act this way.
If I unify the displays the touchscreen acts as expected.
STEPS TO REPRODUCE
1. Use external monitor with touchscreen
OBSERVED RESULT
Mouse not tracking finger but rather it is mapped to the combined pixel
dimensions of the two monitors.
EXPECTED RESULT
The mouse should be under the finger input at all times.
SOFTWARE/OS VERSIONS
Windows: 10 (For the Windows PC that confirmed that this is a software bug, not
hardware)
MacOS: N/A
Linux/KDE Plasma: Neon Stable Developer Edition
(available in About System)
KDE Plasma Version: 5.14.3
KDE Frameworks Version: 5.53.0
Qt Version: 5.11.2
ADDITIONAL INFORMATION
The windows PC, was coincidentally the same laptop as my machine.
Laptop:
Dell Latitude E7240
If needed, I can attach a screen capture of the behaviour in case my
description is not clear
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