Bug 502840

Summary: System Monitor does not show data on all CPU cores when CPU core count increases
Product: [Frameworks and Libraries] ksystemstats Reporter: Gerrit Großkopf <gerrit.grosskopf>
Component: GeneralAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: ahiemstra, john.kizer, nate, plasma-bugs-null
Priority: NOR    
Version First Reported In: 6.3.3   
Target Milestone: ---   
Platform: Manjaro   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Screenshot of a side by side comparision between htop showing 20 cores and the system monitor showing 4

Description Gerrit Großkopf 2025-04-15 14:16:13 UTC
Created attachment 180291 [details]
Screenshot of a side by side comparision between htop showing 20 cores and the system monitor showing 4

SUMMARY

On my Tuxedo laptop I have two profiles, one for battery use that enables 4 cores and one for tethered use that enables all 20 cores, during Startup my laptop was in battery mode so it was 4 cores when I started the plasma session, a few hours later I noticed that thunderbolt did not charge my laptop so I unplugged and plugged back in, that switched thunderbolt mode to enable charging and thus the Laptop switched to the tethered profile enabling all 20 cores

STEPS TO REPRODUCE
1. start pc with some cores disabled
2. enable some additional cores while plasma is running
3. open system monitor to look at cpu graphs

OBSERVED RESULT

it shows 4 cores in the history view

EXPECTED RESULT

it should show 20 cores like htop does

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.12.19-1
KDE Plasma Version: 6.3.3-1
KDE Frameworks Version: 6.3.3-1 I believe
Qt Version: 6.8.2-3 I believe

ADDITIONAL INFORMATION

I'm using the tuxedo control center to edit my profiles but I'm sure this can be achieved through more universal means

Also I have a system monitor sensor widget in my task bar, maybe that is keeping something alive
Comment 1 John Kizer 2025-04-20 20:33:59 UTC
Hi - I don't have a device I can try to reproduce this with, but just to check as hopefully helpful information for others:

* Does System Monitor ever show all 20 cores on your device? 
* If so, then as-is, does it require a device restart while in the tethered profile to do so?
* Does removing the widget change anything?

Thanks!
Comment 2 Bug Janitor Service 2025-05-05 03:47:11 UTC
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 3 Bug Janitor Service 2025-05-20 03:47:11 UTC
🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.