Bug 460794

Summary: bad screen flicker when switching from one activity to another
Product: [Plasma] kwin Reporter: Casey <caseyjp1>
Component: activitiesAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: caseyjp1, joelson.ejr, nate, plasma-bugs-null
Priority: NOR    
Version First Reported In: 5.26.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Casey 2022-10-21 08:41:17 UTC 
SUMMARY
Switching from one activity window to the next causes bad screen flicker and hesitation to draw the window. This lasts for 1-2 seconds and then continues normally.

STEPS TO REPRODUCE
1.  Either use the mouse or the shortcut keys to switch from one activity to another.
2. 
3. 

OBSERVED RESULT
The entire screen flickers and hesitates to draw the new Activity window.

EXPECTED RESULT
A smooth transition to the new activity.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.1
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Kernel Version: 6.0.2-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 6 × AMD FX(tm)-6300 Six-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: AMD Radeon RX 550 / 550 Series
Manufacturer: Gigabyte Technology Co., Ltd.

ADDITIONAL INFORMATION
Journalctl -f shows the following every time this sequence is done and requests a bug report be sent:

 Kandalf plasmashell[1320]: SwitcherBackend: FAILED to get the thumbnail "Unknown error code 0\n\nPlease send a full bug report at https://bugs.kde.org." ("Undocumented Error", "<qt><p><b>Undocumented Error</b></p><p>Unknown error code 0\n\nPlease send a full bug report at https://bugs.kde.org.</p></qt>", "<qt><p><b>Details of the request</b>:</p><ul><li>URL: (unknown)</li><li>Date and time: Friday, October 21, 2022 2:29:14 AM MDT</li><li>Additional information: </li></ul></qt>")
Oct 21 02:29:14 Kandalf plasmashell[1320]: SwitcherBackend: FAILED to get the thumbnail "Unknown error code 0\n\nPlease send a full bug report at https://bugs.kde.org." ("Undocumented Error", "<qt><p><b>Undocumented Error</b></p><p>Unknown error code 0\n\nPlease send a full bug report at https://bugs.kde.org.</p></qt>", "<qt><p><b>Details of the request</b>:</p><ul><li>URL: (unknown)</li><li>Date and time: Friday, October 21, 2022 2:29:14 AM MDT</li><li>Additional information: </li></ul></qt>")
Oct 21 02:29:14 Kandalf kioslave5[346294]: qt.gui.icc: fromIccProfile: failed minimal tag size sanity
Oct 21 02:29:14 Kandalf kioslave5[346294]: qt.gui.icc: fromIccProfile: failed minimal tag size sanity
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:15 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:17 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:17 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:17 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:17 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:21 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:21 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:21 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:21 Kandalf plasmashell[1320]: requesting unexisting screen -1
Oct 21 02:29:27 Kandalf plasmashell[1320]: file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:177: TypeError: Value is null and could not be converted to an object
Oct 21 02:30:13 Kandalf plasmashell[233165]: [2022-10-21 02:30:13.642] [   ] [debug] autosave: no needs to save file
Comment 1 joelsonejr 2023-08-07 15:56:28 UTC 
I'm running KDE  5.27.6, and I wasn't able to reproduce the reported error. 
Tried to reproduce the error, according to the user's orientation, but I didn't  notice the reported misbehavior.  

Besides the information provided, there is any other step that should be followed in order to reproduce the error?

Below is the information about the system used for the test:

OS: Manjaro Linux x86_64
Kernel: 6.1.41-1-MANJARO
Resolution: 2560x1440, 1920x1080
DE: Plasma 5.27.6
WM: KWin
WM Theme: Oxygen
CPU: Intel i7 4790H
GPU: AMD ATI Radeon 6600
Memory: 32043MiB
Comment 2 Bug Janitor Service 2023-08-22 03:45:14 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 3 Bug Janitor Service 2023-09-06 03:45:27 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!