SUMMARY On one of the machines I upgraded to Debian12 from Deb11/KDE the Default shortcut Ctrl+Esc for "Show System Activity" in "KDE Daemon" under Shortcuts is disabled but not on the other. This meant that the process manager didn't show anymore when pressing ctrl+esc after upgrading which can be quite annoyance to users and seems like a problem that is easy to solve: just make sure that shortcut doesn't get disabled. Note that Ctrl+Esc is also set as a shortcut under File->Close. I don't know why it was disabled. It could also be enabled whenever plasma-systemmonitor / systemmonitor gets installed. That this is hard to find under "KDE Daemon" where most users wouldn't expect this entry makes it an even bigger problem but the shortcuts should be working by default without requiring any configuration in general anyway. In addition, the shortcut Ctrl+Shift+Esc should be set for opening plasma-systemmonitor; currently this has to be configured under Custom Shortcuts. Third (and I think all of these are different aspects of the same issue), under System Settings->Background Services there still is an entry "KSysguard" which says "Launches KSysguard on Ctrl+Escape". However, KSysguard doesn't exist anymore in the KDE version of Debian12 (see below) and that shortcut doesn't work. Even when it is running or when stopping and restarting the service the shortcut doesn't work except if it is configured manually in the shortcuts (see above) so this entry seems redundant. I think this issue could also be split into three but as said I think it's just different aspects of the systemmonitor-shortcuts-issue. STEPS TO REPRODUCE 1. Upgrade to Debian12 from Deb11/KDE OBSERVED RESULT Ctrl+Esc doesn't work anymore (and even if "KSysguard" under Background Services" is running) Ctrl+Shift+Esc also doesn't work since Ksysguard was replaced by plasma-systemmonitor and the shortcut still needs to be configured manually EXPECTED RESULT Like on other operating systems like Windows as well as prior versions, the well-known shortcuts for showing processes which are very important to all users should be working by default for all users. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Debian 12 KDE Plasma Version: 5.27.5 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION
Correction: now it seems like the KSysguard background service needs to be running for the Ctrl+Esc shortcut to work. I think this wasn't the case earlier which would be strange. I had to start it again even when the shortcut is configured in KDE Daemon. So it seems like for this shortcut to work *both* things need to be configured: when either is unchecked it doesn't work.
Thank you for your bug report! Debian advises users to not submit bugs upstream (https://www.debian.org/Bugs/Reporting), as this version of the KDE software is out of support from KDE, and so it's possible that the bug exists only in Debian at this point. Could you report the bug to Debian using the report bug utility (https://packages.debian.org/stable/utils/reportbug)? If necessary, the maintainer of the package will forward the bug upstream. Thanks for understanding!
It's here now (I think this shouldn't be closed before): https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068779