Bug 410344

Summary:	Uses 100% CPU
Product:	[Plasma] kwin	Reporter:	Nicolas Girard <girard.nicolas>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	ennereu
Priority:	NOR
Version:	5.16.3
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Nicolas Girard 2019-07-29 09:04:22 UTC

Running kwin-x11 5.16.3-0ubuntu1~ubuntu19.04~ppa1.
Uses 100% CPU.

Killing & restarting using 
  kwin --replace
changes nothing.

Running

  qdbus org.kde.KWin /KWin supportInformation

hangs, then outputs

  Error: org.freedesktop.DBus.Error.NoReply

Possibly related: everytime I'm typing Alt-tab, kwin outputs many (I guess as many as my windows) such lines:

  file:///usr/share/kwin/tabbox/present_windows/contents/ui/main.qml:89:21: QML RowLayout: Binding loop detected for property "height"

Comment 1 Nicolas Girard 2019-07-29 09:09:07 UTC

Things went back to normal after
  pkill -9 kwin ; kwin&

I regularly need to do so, although I'm unsure how to reproduce this defect.

Comment 2 Bennet 2019-07-29 16:58:20 UTC

Seems to be related to https://bugs.kde.org/show_bug.cgi?id=364709 but that got actually fixed in 5.15. Did you activate Desktop Grid?

Comment 3 Nicolas Girard 2019-07-29 17:25:05 UTC

Thanks for your feedback.

> Did you activate Desktop Grid?

Yes, I did

> Seems to be related to https://bugs.kde.org/show_bug.cgi?id=364709 but that got actually fixed in 5.15.

All I can tell, is that my packages earlier than 5.15.

I've switched to the "compact" (effect ? Dunno how these are called), to see how it goes.

Comment 4 Bennet 2019-07-29 18:45:43 UTC

1. Which version version do you use if not 5.16.3 and I suggest updating your packages.
2. Tell wether deactivating "Desktop Grid" helps

Comment 5 Nicolas Girard 2019-07-29 19:39:36 UTC

> 1. Which version version do you use if not 5.16.3 and I suggest updating your packages.

I confirm I'm using version 5.16.3. I meant "more recent", not "earlier", sorry.

> 2. Tell whether deactivating "Desktop Grid" helps

What I can do is keep using my machine using the "compact" effect for a few days, and report back afterwards.

Comment 6 Vlad Zahorodnii 2019-07-30 15:42:57 UTC

Please provide the following info:

- steps to reproduce
- backtrace when kwin consumes 100% cpu

https://community.kde.org/KWin/Debugging

Comment 7 Bug Janitor Service 2019-08-14 04:33:09 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 8 Bug Janitor Service 2019-08-29 04:33:09 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!