If System Settings > Monitor > Scaling is greater than 1 (tested with 1.5 & 2), Anti-Aliasing of fonts breaks in important applications. E.g. System Settings > Desktop Effects > Effects is broken: no anti-aliasing in the right content window. Same happens to Okular which can no longer use anti-aliasing for PDFs. This is just related to the Scaling factor. Just setting fonts DPI forced to 144 alone, is working with anti-aliasing. Only the scaling mechanism breaks some stuff here.
Created attachment 107577 [details] Scale 1,5 NOK Open this image with 100% (original size) and compare the "e" in "Hint: to find out or configure"
Created attachment 107578 [details] Scale 1,5 Login NOK Open this image with 100% (original size) and compare the "e" in "Hint: to find out or configure"
Fixed in Qt 5.10
Sry, but this is not fixed. Exactly the same result with Qt 5.10 Beta (tested with KDE Neon devn unstable "deb http://archive.neon.kde.org/testing xenial main"). Same on Qt 5.9.2 (tested with Suse Krypton). Apart from the ugly fonts in Okular and system settings, all log screen images are not aliased, too (after clicking kde menu->logout images for shutdown, logout, restart are totally ugly).
Created attachment 108413 [details] Scale 1,0 OK
Created attachment 108488 [details] Scale 1,5 NOK Plasma 5.11.90 Even worse in Plasma 5.11.90
I have the same problem in KDE Neon.
Okular is unrelated. That's on them to fix. (which btw, is fixed for next Applications release) Everything should work fine with 2.0 - please post a screenshot of that and include the output of running "env". Embedded QtQuick did have an issue with fractional scaling but that should be fixed by dfce0a8feceeb7156eba6ac5d8d3521e3009a583 in QtDeclarative. Can you double double check you have Qt 5.10 running please. You can see it in menu -> about system settings -> libraries.
Created attachment 108509 [details] 2.0 OK Desktop effects
Created attachment 108510 [details] 1.5 NOK Desktop effects
Created attachment 108511 [details] env
You're right, tested with "openSUSE_Krypton.x86_64-5.11.90-Build1.44.iso" (QT 5.10, before I just tested with Neon Live and guess that not all was loaded after logging out and back in). >(which btw, is fixed for next Applications release) Yes, fixed in Krypton ;) >Everything should work fine with 2.0 True, all stuff is fine with 2.0. Just the login screen & desktop effects has not changed with QT5.10 and is still not aliased ( https://bugs.kde.org/attachment.cgi?id=107578 ) with "about system settings -> libraries" = "build against 5.10.0". Env attached. With 1.5 broken: https://bugs.kde.org/attachment.cgi?id=108509 With 2.0 it's OK: https://bugs.kde.org/attachment.cgi?id=108510
What's wrong with the 1.5 in that picture?
I think the prefix for the images is wrong since the 2.0 is fuzzy in the last example.
It's very interesting that the left sidebar looks ok in that screenshot.
Created attachment 108547 [details] Side by side comparism 1,5 & 2,0 Exactly, the left sidebar is fine, just the right content area is messed up. BTW: just checked, files are named correctly (as mentioned, they have to be opened in the original size, not zoomed). Attached here is a side-by-side comparism.
I can confirm the same issue on my dell xps 15 4k, when i set scaling to non integer value (2.2 in my case) i get the same fuzzy looking fonts. Im also running qt 5.10, and it didnt solve any issues.
This is caused by the use of QTQuickControls widgets that use a font rendering style that doesn't support non-integer scale factors. System Settings KCMs are being rewritten (see https://phabricator.kde.org/tag/plasma_kcm_redesign/), which will fix this one KCM at a time. Plasma itself will be fixed with https://phabricator.kde.org/D11244
Git commit a21bc11fe11651f6d211489ebfc8435cef877194 by Nathaniel Graham. Committed on 16/03/2018 at 22:26. Pushed by ngraham into branch 'master'. Fix text scaling with non-integer scale factors when PLASMA_USE_QT_SCALING=1 is set Summary: When `PLASMA_USE_QT_SCALING=1` is set, Plasma uses native Qt scaling. This works fine for integer scale factors, and fixes a lot of bugs (see [[https://bugs.kde.org/show_bug.cgi?id=356446|Bug 356446]]) but it introduces a new one: with non-integer scale factors, text becomes blurry and pixellated because of a bug in `Text.NativeRendering`: https://bugreports.qt.io/browse/QTBUG-67007 QQC2-desktop-style forces the use of `Text.QtRendering` rendering for non-integer scale factors, successfully working around the problem. But PlasmaComponents QML objects don't implement the same workaround, so we see the issue in Plasma. This patch fixes that, and gets us one step closer to being able to use Qt scaling in Plasmashell. There is no effect when `PLASMA_USE_QT_SCALING=1` is not being used. FIXED-IN 5.13 Related: bug 391691, bug 386216, bug 391695, bug 391694, bug 385547, bug 391692, bug 356446 Test Plan: Before: `PLASMA_USE_QT_SCALING=1` set, 1.2 scale factor: Plasma text looks awful: {F5749797} After: `PLASMA_USE_QT_SCALING=1` set, 1.2 scale factor: Plasma text looks amazing! {F5749798} Note that we still get sub-pixel anti-aliasing and good kerning. There appear to be no layout regressions. Without both `PLASMA_USE_QT_SCALING=1` and a non-integer scale factor set, there is no visual change compared to the status quo. Reviewers: #plasma, davidedmundson Reviewed By: #plasma, davidedmundson Subscribers: mart, broulik, #frameworks Tags: #frameworks Differential Revision: https://phabricator.kde.org/D11244 M +4 -2 examples/applets/testtheme/contents/ui/FontGizmo.qml M +5 -1 src/declarativeimports/plasmacomponents/qml/Label.qml M +5 -1 src/declarativeimports/plasmacomponents/qml/private/DualStateButton.qml M +4 -0 src/declarativeimports/plasmacomponents3/ComboBox.qml M +5 -1 src/declarativeimports/plasmacomponents3/Label.qml M +5 -1 src/declarativeimports/plasmacomponents3/TextArea.qml M +5 -1 src/declarativeimports/plasmacomponents3/TextField.qml M +5 -0 src/declarativeimports/plasmastyle/ComboBoxStyle.qml M +4 -1 src/declarativeimports/plasmastyle/SpinBoxStyle.qml M +4 -1 src/declarativeimports/plasmastyle/TextAreaStyle.qml M +4 -1 src/declarativeimports/plasmastyle/TextFieldStyle.qml https://commits.kde.org/plasma-framework/a21bc11fe11651f6d211489ebfc8435cef877194