Bug 474617

Summary:	171% CPU Usage With Total System Block (100% Repeatable). Gwenview Freezes Computer.
Product:	[Applications] gwenview	Reporter:	John <kdelovaa>
Component:	general	Assignee:	Gwenview Bugs <gwenview-bugs-null>
Status:	CLOSED DOWNSTREAM
Severity:	normal	CC:	natalie_clarius, nate, nicolas.fella
Priority:	NOR
Version First Reported In:	23.08.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description John 2023-09-17 14:41:56 UTC

SUMMARY
***
Why can I just enjoy my photos like everyone on a Mac or Windows?
***
Browsing (JPEG) photos with Gwenview should not FREEZE computer. THIS IS CRITICAL. Happens regardless of the settings (options on: low resource usage and no animiations). Gwenview will use over 100% CPU and will totally lock the computer. Does not happen with $ sxiv -f '/xxx/xxx/sdc1/my_old_photos/'. You can browse photos and enjoy your old photos.
***

STEPS TO REPRODUCE
1. Open Dolphin and chose one photo from your old collection. Click on it.
2. Close Dolphin
3. Press ctrl+shift+f
4. Now press right arrow repeteadly, enjoying each photo the photo (for a second or two). Continue watching your photos while clicking right arrow.
5. GRAVE! I had my computer go crazy with 176% CPU usage and TOTAL LOCK/FREEZE. Computer did not collected backtrace. It froze (reproducable 100%)
THIS IS NOT NORMAL BEHAVIOR. COMPUTER SHOULD NOT FREEZE WHILE SIMPLE PHOTO BROWSING OF YOUR OLD COLLECTION! ITS REPEATABLE AND ANNOYING AS THESE. CAPITAL LETTERS.

OBSERVED RESULT
Computer Total Freeze.

EXPECTED RESULT
Make KDE be able to normally browse photos without computer freeze. Click first photo and enjoy next one by pressing right arrow to see the next photo. On a normal computer (Apple, Windows,...) you press right arrow and the computer does not go crazy with CPU and does not freeze.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux (not Manjaro)
(available in About System)
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10

ADDITIONAL INFORMATION
100% Reproducable. Click first photo then go full screen and keep pressing right arrow... and F R E E Z E.
You can also go to setting while in full screen (ctrl+shift+f) and turn off "thumbnails", it doesn't matter if you turn off thumbnails in full screen or not. In both cases it freezes the computer. This is not normal behaviour. Why can I just enjoy photos like everyone on a Mac or Windows?

Comment 1 Nate Graham 2023-09-17 16:30:37 UTC

Not 100% reproducible for me. 0% reproducible, in fact.

Given the very large number of bug reports you've submitted over the years about image-related issues that were eventually traced back to local problems with your computer, I'm inclined to close this one as well, in the absence of any evidence to the contrary.

The next time you encounter an image-related issue with KDE software, please reach out for help somewhere other than the bug tracker, and only submit a bug report if there's direct evidence that there is in fact a bug with KDE's software which isn't caused by a local setup issue on your machine.

Thanks!