Bug 351597

Summary:	Plasmashell causes tearing if I alt+tab out of a game.
Product:	[Plasma] plasmashell	Reporter:	Victor B. Gonzalez <bugs.kde.org.id324>
Component:	general	Assignee:	David Edmundson <kde>
Status:	RESOLVED WORKSFORME
Severity:	minor	CC:	bshah, justin.zobel, lehmax, plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.3.90
Target Milestone:	1.0
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Victor B. Gonzalez 2015-08-22 04:13:00 UTC

This is reproducible every time. I thought it was KWin but Openbox led me to plasmashell as the culprit. If I start up a game e.g., Left 4 Dead 2 through Steam with vsync enabled, all is well. The moment I alt+tab out of the game and return to it, there is tearing that I just can't get rid of until I kill plasmashell.

Reproducible: Always

Steps to Reproduce:
1. Open a game e.g., Left 4 Dead 2, Team Fortress 2
2. If vsync is enabled, it's respected as long as you don't lose focus of the game
3. Alt+Tab out of the game and return to it


Actual Results:  
Even if vsync was enabled and was working, it appears to no longer work as tearing becomes constant.

Expected Results:  
No tearing.

I can work around this by killing plasmashell. If I kill it, the game is tear free again. I actually created a shortcut of "killall plasmashell" and it works a charm. I just wish I didn't need the shortcut :)

Comment 1 lehmax 2016-06-11 10:01:02 UTC

I can confirm that it's still happening on Kubuntu 16.04.

Comment 2 Justin Zobel 2020-11-23 03:23:10 UTC

Thanks for the reports.

Is it possible for one or both of you to please test and confirm if this issue is still occurring or if this bug report can be marked as resolved. I've set the bug status to "needsinfo" pending your response, please change back to "reported" or "resolved" when you respond, thanks.

Comment 3 Victor B. Gonzalez 2020-11-24 17:02:24 UTC

Unfortunately I can no longer test as I've moved to Manjaro which never suffered from tearing. As far as I am concerned, KDE Plasma on Manjaro is amazing right our of the box (granted some minor bugs and annoyances).

Sorry I can no longer help with this 5 year old issue :(

Comment 4 Justin Zobel 2020-11-24 22:22:05 UTC

(In reply to Victor B. Gonzalez from comment #3)
> Unfortunately I can no longer test as I've moved to Manjaro which never
> suffered from tearing. As far as I am concerned, KDE Plasma on Manjaro is
> amazing right our of the box (granted some minor bugs and annoyances).
> 
> Sorry I can no longer help with this 5 year old issue :(

Thanks for the info, I'll see if lehmax replies on this one, if not we'll close it out.

Comment 5 Bug Janitor Service 2020-12-09 04:34:05 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 6 Bug Janitor Service 2020-12-24 04:34:53 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!