Bug 477678

Summary:	Crispy text in various pieces of Qt6 software when using fractional scale factor
Product:	[Plasma] kwin	Reporter:	Robby Engelmann <robby.engelmann>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	kde, nate, robby.engelmann, w01dnick
Priority:	NOR	Keywords:	qt6
Version:	master
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	crispy text reading akregator feed clear text in akregator feed list crispy in panel clear in panel

Description Robby Engelmann 2023-11-28 14:49:26 UTC

SUMMARY
Since I switched to Mega-release master builds in openSUSE, various text content field show crispy texts. See Attchment.

STEPS TO REPRODUCE
1. try to read text content in akregator or kmails 

OBSERVED RESULT
crispy text, more difficult to read

EXPECTED RESULT
clear test

Operating System: openSUSE Tumbleweed 20231127
KDE Plasma Version: 5.81.80
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0
Kernel Version: 6.6.2-1-default (64-bit)
Graphics Platform: Wayland
Processors: 20 × 13th Gen Intel® Core™ i7-13700H
Memory: 62.5 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: TUXEDO
Product Name: TUXEDO InfinityBook Pro Gen8 (MK1)

Comment 1 Robby Engelmann 2023-11-28 14:50:30 UTC

Created attachment 163573 [details]
crispy text reading akregator feed

Comment 2 Robby Engelmann 2023-11-28 14:58:42 UTC

Created attachment 163574 [details]
clear text in akregator feed list

Comment 3 Nate Graham 2023-11-28 20:58:57 UTC

Which others?

Comment 4 Robby Engelmann 2023-11-29 07:20:07 UTC

until now I recognized it for:
-Texts in Akregator and Kmail (always
-Texts in Plasma notes (I think if it is not active; when click into it, the text changes from crispy to clear)
-Titles in the plasma panel (might be, that here only the lower part is not rendered if full screen app touches the panel) - see attachments

Comment 5 Robby Engelmann 2023-11-29 07:20:34 UTC

Created attachment 163602 [details]
crispy in panel

Comment 6 Robby Engelmann 2023-11-29 07:20:49 UTC

Created attachment 163603 [details]
clear in panel

Comment 7 Nate Graham 2023-11-29 17:57:25 UTC

Are you by any chance using a scale factor other than 100% or 200%?

Comment 8 Robby Engelmann 2023-11-29 18:15:04 UTC

I am quite sure, that the answer is YES, but I cannot look it up, because the Display & Monitor KCM is crashing here every time

Comment 9 Mykola Krachkovsky 2023-12-01 21:57:04 UTC

(In reply to Robby Engelmann from comment #1)
> Created attachment 163573 [details]
> crispy text reading akregator feed

I think this one is due Qt6 QtWebEngine bug: https://bugreports.qt.io/browse/QTBUG-113574

For Falkon I use `QT_SCALE_FACTOR_ROUNDING_POLICY=RoundPreferFloor` workaround.

Comment 10 Robby Engelmann 2023-12-02 07:39:40 UTC

Indeed, this workaround solves the issue. For the time being, I export it on session start.
Is this bug now resolved -> upstream?

Comment 11 Mykola Krachkovsky 2023-12-03 15:57:08 UTC

(In reply to Robby Engelmann from comment #10)
> Indeed, this workaround solves the issue. For the time being, I export it on
> session start.
> Is this bug now resolved -> upstream?

Well, I'm not sure about this:

(In reply to Robby Engelmann from comment #5)
> Created attachment 163602 [details]
> crispy in panel

This one uses AFAIK QtQuick, so shouldn't be affected by WebEngine bug.

Comment 12 Robby Engelmann 2023-12-03 18:27:04 UTC

(In reply to Mykola Krachkovsky from comment #11)
> (In reply to Robby Engelmann from comment #10)
> > Indeed, this workaround solves the issue. For the time being, I export it on
> > session start.
> > Is this bug now resolved -> upstream?
> 
> Well, I'm not sure about this:
> 
> (In reply to Robby Engelmann from comment #5)
> > Created attachment 163602 [details]
> > crispy in panel
> 
> This one uses AFAIK QtQuick, so shouldn't be affected by WebEngine bug.


This one is resolved as works for me. Possible there only the lowest part was not shown at all. But look fine now since some days