Bug 351463

Summary: CPU usage spikes when entering lock screen
Product: [Plasma] kscreenlocker Reporter: Steven Roose <stevenroose>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: normal CC: aspotashev, bhush94, chaboisseau, mgraesslin, nate, plasma-bugs, stevenroose
Priority: NOR    
Version: unspecified   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Steven Roose 2015-08-19 00:08:01 UTC 
Whenever my laptop goes into the lock screen automatically, I start to hear my fans blasting like crazy. I recognize the sound, it means something is using a whole CPU thread.

My plasma version:
kf5-plasma.i686 : 5.12.0-2.fc22

I found this issue on Launchpad: 
https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1435641

But it's not the same. I tried their suggested workaround and the problem does not disappear.

I did not have the chance to SSH from another machine to check what process is using the CPU. Is there a way I can analyze it from my own machine?

Reproducible: Always

Steps to Reproduce:
1. Wait.
2. Lockscreen comes up.

Actual Results:  
Fans start to blast.

Expected Results:  
Fans do not start to blast.
Comment 1 Martin Flöser 2015-12-15 17:22:29 UTC 
you could try to just start kscreenlocker_greet program in testing mode to see whether that already triggers the CPU load.
Comment 2 Cyril Chaboisseau 2017-11-25 08:57:36 UTC 
if you have an nVidia, then chances are great that this is the same bug as #347772
Comment 3 Nate Graham 2021-06-21 22:28:36 UTC 
This annoying bug was fixed in Plasma 5.22

*** This bug has been marked as a duplicate of bug 347772 ***