Bug 491553

Summary:	plasma 6 regression: high CPU usage in idle
Product:	[Plasma] plasmashell	Reporter:	Ilia Kats <ilia-kats>
Component:	generic-performance	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	nate, rpbikker
Priority:	NOR
Version First Reported In:	6.1.3
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Ilia Kats 2024-08-10 22:25:34 UTC

When idling, the plasmashell process uses 9-10 % CPU (on a relatively powerfull desktop machine), causing higher than usual temperatures and energy usage. I do not recall observing this in Plasma 5. I'm currently on X11, I have a dual-monitor set-up, and I have several system monitor widgets on my desktop, in case this is relevant.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4
Qt Version: 6.7.2

Comment 1 Nate Graham 2024-08-12 16:51:02 UTC

Does it reproduce in a new clean user account with no customizations?

Comment 2 Ilia Kats 2024-08-12 16:57:32 UTC

I haven't tried a clean user account, but on a second machine (laptop, X11, dual-monitor, no widgets on the desktop) I don't see high CPU usage. I can try adding some system monitor widgets there and see what happens.

Comment 3 Ilia Kats 2024-08-14 06:55:55 UTC

Apologies, my last statement was incorrect: I had system monitor set to show unscaled CPU load on the desktop and scaled CPU load on the laptop. Using unscaled CPU load on the laptop, I also see plasmashell using 9-10 % CPU in idle without any widgets on the desktop and without anything else that needs to be constantly updated in the panel. I can increase the CPU load by adding system monitor widgets to the desktop.

Comment 4 Reinier 2024-08-14 20:54:37 UTC

If you're using a panel in auto-hide mode, you might want to read into #487895.

Comment 5 Ilia Kats 2024-08-15 09:30:59 UTC

I'm not using auto-hiding and I've disabled floating.

Comment 6 Bug Janitor Service 2024-08-30 03:47:53 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 7 Bug Janitor Service 2024-09-14 03:47:09 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.