Bug 480377

Summary:	Weird transparent visual glitch
Product:	[Applications] okular	Reporter:	Tammes Burghard <kde>
Component:	general	Assignee:	Okular developers <okular-devel>
Status:	REPORTED ---
Severity:	normal	CC:	hartvarab, traceydick
Priority:	NOR	Keywords:	qt6
Version:	24.01.90
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Screen recording of the glitchy okular window

Description Tammes Burghard 2024-01-26 23:09:28 UTC

SUMMARY
***
I can not reproduce this consistently, but found a way to make it happen with about 50% consistency:
Being on a tablet and using touch is essential here I think.
***


STEPS TO REPRODUCE
1. Open Okular and maximize it
2. Open a PDF file
3. go to the next workspace via three-finger-touch-swipe
4. Rotate the tablet to be vertical and in touch mode
5. three-finger-swipe back to the workspace with Okular in it

OBSERVED RESULT
Not always, but often times, the document area becomes transparent and a bunch of glitches appear, see attached video

EXPECTED RESULT
No visual glitches, the document gets shown in a vertical Okular window

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.92.0
KDE Frameworks Version: 5.248.0
Qt Version: 6.7.0
Kernel Version: 6.7.1-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Pentium® CPU 4425Y @ 1.70GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 615
Manufacturer: Microsoft Corporation
Product Name: Surface Go 2
System Version: 1

Comment 1 Tammes Burghard 2024-01-26 23:12:54 UTC

Created attachment 165262 [details]
Screen recording of the glitchy okular window

Comment 2 Tammes Burghard 2024-01-26 23:15:08 UTC

(In reply to Tammes Burghard from comment #1)
> Created attachment 165262 [details]
> Screen recording of the glitchy okular window

It also happened without plasmashell crashing, but the shell crashed a lot while I tried to consistently reproduce this, so I did not bother to retry until I get it without crash.

Comment 3 Alex 2024-06-27 10:32:17 UTC

Hello,

I am experiencing this bug regularly too, it looks the same as in recording. It seems to be happening after some time, I don't change my screen orientation at all and plasmashell hasn't crashed for me. It might be related to changing the workspaces/desktops with three-finger-touch gesture, but it might as well not be related. I have also had it happen after waking my laptop from sleep. I usually have multiple instances of Okular open.

I can recover normal behavior by zooming in or out with the two-finger-touch gesture, but over means of zooming don't seem to work.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel Version: 6.9.6-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-5300U CPU @ 2.30GHz
Memory: 3.7 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 5500
Manufacturer: LENOVO
System Version: ThinkPad S1 Yoga 12