https://bugs.kde.org/show_bug.cgi?id=440261
Bug ID: 440261
Summary: System Monitoring (CPU/Memory) is broken on AMD Kabini
Product: plasma-systemmonitor
Version: 5.22.0
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: ksysguard-b...@kde.org
Reporter: wedge...@wedge009.net
CC: ahiems...@heimr.nl, plasma-b...@kde.org
Target Milestone: ---
SUMMARY
Since Plasma 5.22.0 onwards, as packaged via Kubuntu Backports PPA, the System
Monitor widgets for monitoring per-core CPU usage and memory usage display
nothing on AMD Kabini APU. My guess is that this is possibly related to the
migration away from KSysGuard since just rolling back the widgets to Plasma
5.21 did not resolve the problem. I had to roll back the whole platform to
Plasma 5.21 before the monitor widgets work again.
Interestingly, this only appears to be an issue on my AMD Kabini system. The
System Monitor widgets work just fine on Plasma 5.22 with AMD Phenom II CPU and
AMD Ontario APU. My other systems are using Ubuntu LTS and thus still using the
old System Load Viewer - which I very much prefer (see Bugs #437114/#437124) -
and so are not yet using the recent Plasma releases.
I confirmed narrowed down the regression moving from Plasma 5.21.5 to Plasma
5.22.x after doing a clean OS installation.
STEPS TO REPRODUCE
1. Have an AMD Kabini system (I recognise hardware-specific issues will be hard
to diagnose so please advise what I can do to provide debugging information).
2. Install Kubuntu 21.04 and add System Monitoring widgets for Plasma 5.21.
Observe that the widgets function as expected.
3. Install Kubuntu Backports PPA to update to Plasma 5.22. (At time of writing,
currently has 5.22.3 but I was observing this problem since 5.22.0.)
(I doubt the issue is specific to Kubuntu packaging since 5.21.5 works fine but
if it is, let me know so I can advise them.)
OBSERVED RESULT
CPU and Memory monitor widgets are blank.
EXPECTED RESULT
CPU and Memory monitor widgets report current CPU and memory usage.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04
KDE Plasma Version: Plasma 5.22.3 (at time of writing, problem observed since
5.22.0)
KDE Frameworks Version: 5.84.0
Qt Version: 5.12.2
ADDITIONAL INFORMATION
As already stated, please advise what I should do to provide additional
information. It's not clear to me how system information is gathered by the
widgets, so I'm not sure where to look for logs, etc.
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