https://bugs.kde.org/show_bug.cgi?id=476368
Bug ID: 476368
Summary: Output mapping of identical touchscreen devices
doesn't remain after reboot
Classification: Applications
Product: systemsettings
Version: 5.27.9
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_touchscreen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
When two identical touchscreen devices are connected, it is not possible to
configure their output mappings properly due to them having the exact same
name. Looking at ~/.config/kcminputrc, the problem seems to be that when the
first touch input is configured, the configuration for the second touch input
simply overwrites the first entry due to the identical device names.
Strangely enough, directly after the changes from the system settings are
applied, everything seems fine. The problem occurs when the configuration is
loaded after a reboot, where both touch inputs seem to be mapped to one
display.
It seems like extra information is needed to uniquely identify identical touch
input devices.
STEPS TO REPRODUCE
1. Have two identical touchscreen displays connected
2. Map each touch input to their corresponding display output (through trial
and error because both devices have the same name)
3. Observe how the mappings seem to be correct
4. Reboot
5. Observe how the mappings are no longer correct
OBSERVED RESULT
Both touchscreen inputs are mapped to the same display output.
EXPECTED RESULT
The touchscreen inputs are mapped to their corresponding display output, as was
the case before the reboot.
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