Bug 487168

Summary:	KWin 1.5x UI Scaling + 2256x1504 results in garbage pixels at the bottom of the screen
Product:	[Plasma] kwin	Reporter:	Wyatt Childers <kdebugs.81do7>
Component:	core	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	kdebugs.81do7, xaver.hugl
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	pixels on the lock screen that don't belong app icons when unlocked a short video of the glitch on the lock screen

Description Wyatt Childers 2024-05-18 03:45:18 UTC

Created attachment 169585 [details]
pixels on the lock screen that don't belong

SUMMARY
On my Framework 13" I've noticed the bottom row of pixels is occasionally "garbage" like it isn't properly being used by either Plasma or Kwin.

This effect carries over to the lock screen where some of the blue outline from the Icon Only task Manager can still be seen (see the attached screen shots).

REPRODUCTION
I believe to reproduce this you need a 2256x1504 (such as the one used by the framework, and a 1.5x scaling factor). 

When I turned off scaling, I could no longer see the buggy pixels. Enabling scaling again lead me to see the bottom row of pixels from the 1.0x scale factor (tiny status icons) at the bottom of the lock screen.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.5.6-300.fc39.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840U w/ Radeon 780M Graphics
Memory: 14.9 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: Framework
Product Name: Laptop 13 (AMD Ryzen 7040Series)
System Version: A7

ADDITIONAL INFORMATION

This is similar to Bug 460896 but I believe it's different (related to KWin's scaling).

Comment 1 Wyatt Childers 2024-05-18 03:45:59 UTC

Created attachment 169586 [details]
app icons when unlocked

Comment 2 Wyatt Childers 2024-05-18 04:11:02 UTC

Created attachment 169587 [details]
a short video of the glitch on the lock screen

This is an interesting one as it shows the glitch occurring with pixels that seemingly have nothing to do with anything.

This isn't limited to just happening on the lock screen, but it demonstrates how weird and distracting this case be. 

Sometimes things move like this, sometimes they don't.

Comment 3 Zamundaaa 2024-05-18 20:52:41 UTC


*** This bug has been marked as a duplicate of bug 482987 ***