https://bugs.kde.org/show_bug.cgi?id=466136
Bug ID: 466136
Summary: Multiscreen does not work if the serialnumber is
nearly the same
Classification: Plasma
Product: KScreen
Version: 5.27.0
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: simonschae...@posteo.de
Target Milestone: ---
Created attachment 156529
--> https://bugs.kde.org/attachment.cgi?id=156529&action=edit
screenshot of one of the screens with shorter identify string (with already
applied workaround)
SUMMARY
When having two monitors from the same vendor where in the serial number only
the last digit differs, the multiscreen setup is not stored correctly. In the
office we have quite a lot of the same monitors from the same vendor and on one
of the shared places two monitors with nearly the same id are placed next to
each other. A screen setup with those does not work. While the Configuration
screen inside the Settings shows the 13digit serialnumber (the number between
the name and the resolution) correctly, the identify function only shows the
first 12 digits, so my guess is that the settings only store 12 as well, which
then mixes them randomly at each start.
STEPS TO REPRODUCE
1. get two screens, with nearly the same id (has to change after the 12th
digit)
2. connect to pc
3. configure
4. reboot
5. rearranged, if not go back to 4 again
OBSERVED RESULT
Mixed up screen setup after reboot
EXPECTED RESULT
use the correct id of 13 digits (or more if there are more given)
WORKAROUND
Exchange monitors from shared desk until they differ in at least the 12th
digit. This does not work if you only got two monitors.
ADDITIONAL INFORMATION
The screens are: "Iiyama North America PL2893UH"
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