Bug 457316 - Lockscreen: When turning on second screen, part of the opened windows become visible for a split second on the primary screen
Summary: Lockscreen: When turning on second screen, part of the opened windows become ...
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: multi-screen (show other bugs)
Version: 5.25.3
Platform: openSUSE Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: wayland
Depends on:
Blocks:
 
Reported: 2022-07-30 21:17 UTC by postix
Modified: 2023-03-14 17:31 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
kWin Debug Information (7.06 KB, text/plain)
2022-07-30 21:17 UTC, postix 		Details
Screenshot (842.73 KB, image/png)
2022-07-30 21:19 UTC, postix 		Details
Screenshot 2 (843.89 KB, image/png)
2022-07-30 21:23 UTC, postix 		Details
Screenshots: Frame by frame (771.79 KB, image/jpeg)
2022-07-30 21:29 UTC, postix 		Details
Screenrecording (1.38 MB, video/mp4)
2022-07-30 21:38 UTC, postix 		Details
journalctl log (216.13 KB, text/x-log)
2022-07-31 09:42 UTC, postix 		Details
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Description postix 2022-07-30 21:17:09 UTC 
Created attachment 151006 [details]
kWin Debug Information

SUMMARY

Three screens from left to right:
A: 2k@100% (HDMI, disabled), 
B: 4k@200% primary (DP), 
C: 2k@100% (HDMI)

STEPS TO REPRODUCE
1.  Lock screen
2.  Put C into Standby (TV)
3.  Turn on C (by pressing on your remote)

OBSERVED RESULT
There's a visual glitch visible on the B and parts of the opened windows are displayed for a split second

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20220728
KDE Plasma Version: 5.25.3
KDE Frameworks Version: 5.96.0
Qt Version: 5.15.5
Kernel Version: 5.18.11-1-default (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 580 Series
Comment 1 postix 2022-07-30 21:19:49 UTC 
Created attachment 151007 [details]
Screenshot
Comment 2 postix 2022-07-30 21:20:49 UTC 
It looks like the screenlocker's surface becomes resized for a split second, not covering the whole screen anymore and the content beneath it is revealed.
Comment 3 postix 2022-07-30 21:23:33 UTC 
Created attachment 151008 [details]
Screenshot 2

Here's another sample, where no content is revealed though.
Comment 4 postix 2022-07-30 21:29:43 UTC 
Created attachment 151009 [details]
Screenshots: Frame by frame
Comment 5 postix 2022-07-30 21:38:35 UTC 
Created attachment 151010 [details]
Screenrecording

A very last example: Screen recording related to attachment "Frame by Frame".
Comment 6 postix 2022-07-30 21:47:53 UTC 
Side node: When I finally unlocked the screen, all windows were moved to B and C showed the desktop of disabled screen A (wallpaper + widget), which was scaled down in the upper left corner, covering ~2/3 of B's screen.
This issue went away after several seconds, before I could take a screenshot.
Comment 7 postix 2022-07-30 21:48:38 UTC 
> ~2/3 of B's screen.
I meant "~2/3 of C's screen."
Comment 8 postix 2022-07-31 09:42:00 UTC 
Created attachment 151030 [details]
journalctl log

Please find the journalctl log attached. Screen "C" was turned on/off several times for reproduction of the issue.