https://bugs.kde.org/show_bug.cgi?id=473572
Bug ID: 473572
Summary: QT_SCREEN_SCALE_FACTORS causes pixelated rendering of
some QT apps on X11 when fractional scaling is on
(Telegram, MegaSync...)
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: pshirs...@gmail.com
Target Milestone: ---
I'm using Plasma with hiDPI displays, so I have fractional scaling turned on.
When fractional scaling is on, plasma-workspace sets environment variable
QT_SCREEN_SCALE_FACTORS. For some reason this variable causes strange rendering
issues with Telegram, MegaSync and some other QT applications.
The only way to remove this variable is to patch startplasma-x11.cpp:
```
diff --color -ru a/startkde/startplasma-x11.cpp b/startkde/startplasma-x11.cpp
--- a/startkde/startplasma-x11.cpp 2022-08-23 17:55:27.827687762 +0100
+++ b/startkde/startplasma-x11.cpp 2022-08-23 17:56:11.170498094 +0100
@@ -48,7 +48,7 @@
KConfigGroup kscreenGroup = cfg.group("KScreen");
const auto screenScaleFactors =
kscreenGroup.readEntry("ScreenScaleFactors", QByteArray());
if (!screenScaleFactors.isEmpty()) {
- qputenv("QT_SCREEN_SCALE_FACTORS", screenScaleFactors);
+ // qputenv("QT_SCREEN_SCALE_FACTORS", screenScaleFactors);
}
```
I haven't noticed any rendering issues with this variable unset, only
improvements.
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