Bug 363909

Summary:	After suspend plasmashell and X use about 2 cpus
Product:	[Plasma] plasmashell	Reporter:	Unknown <null>
Component:	general	Assignee:	David Edmundson <kde>
Status:	RESOLVED DUPLICATE
Severity:	minor	CC:	benedikt.repscher31, bshah, kde, nroycea+kde, plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.6.4
Target Milestone:	1.0
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Backtrace of the main plasmashell process and of all the threads Backtrace of the plasmashell thread probably locking the main process htop screenshot

Description Unknown 2016-06-03 18:56:41 UTC

From time to time, upon resuming up from suspension, plasmashell and X occupy about 2 CPUs and 
make the computer very sluggish.

htop shows the main plasmashell thread, one of its sub-threads and X in the top three positions as CPU usage.
Killing and restarting plasmashell solves the issue for some time.

I have seen this happening in session in which I use a secondary screen as well as session in which I don't.

Reproducible: Sometimes

Steps to Reproduce:
1. put the computer to sleep
2. wake it up

Actual Results:  
Plasmashell and X use too much CPU, probably because of a deadlock somewhere

Expected Results:  
Low CPU usage as usual

I am on openSUSE Tumbleweed (,20160531) with:

Repository: repo-oss
Name: plasma5-workspace
Version: 5.6.4-1.1

The computer is a Dell Latitude E6430s with Intel graphics.

I've attached a screenshot of htop and the backtrace of the two plasmashell processes.

Comment 1 Unknown 2016-06-03 18:58:42 UTC

Created attachment 99345 [details]
Backtrace of the main plasmashell process and of all the threads

Comment 2 Unknown 2016-06-03 19:00:42 UTC

Created attachment 99346 [details]
Backtrace of the plasmashell thread probably locking the main process

Comment 3 Unknown 2016-06-03 19:01:30 UTC

Created attachment 99347 [details]
htop screenshot

Comment 4 vindicator 2016-06-23 20:25:56 UTC

Just adding myself to this report since it basically mirrors my issue as well.
It's been happening for well over a month and I looked into it a little before, but now it's really bugging me and I want to see it get resolved.

I'm using Archlinux, single display, 5 KDE widgets on the side to keep tabs on resources.
I don't know when it happens, I'll just suddenly notice my mouse cursor skip/jitter and then note my cpu widget much higher while at "idle".

I will also confirm killing plasmashell and restarting it brings the cpu usage back to normal.

Comment 5 Unknown 2016-06-26 15:48:07 UTC

Sometimes it happens that plasmashell cpu usage raises over time. When I realise it, it is usually above 70%

Comment 6 benedikt.repscher31 2016-07-24 13:57:24 UTC

Same behaviour on Arch.
This happenes since the update to Plasma 5.7.

Comment 7 David Edmundson 2016-08-16 12:27:54 UTC


*** This bug has been marked as a duplicate of bug 356479 ***