| Summary: | Most KDE Applications Do Not Respect Fontconfig | ||
|---|---|---|---|
| Product: | [Applications] systemsettings | Reporter: | Marek Paśnikowski <mail> |
| Component: | kcm_fonts | Assignee: | Plasma Bugs List <plasma-bugs> |
| Status: | RESOLVED NOT A BUG | ||
| Severity: | normal | CC: | ahiemstra, info, katyaberezyaka, kde, nate |
| Priority: | NOR | ||
| Version: | unspecified | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| See Also: |
https://bugs.kde.org/show_bug.cgi?id=431428 https://bugs.kde.org/show_bug.cgi?id=431197 |
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| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: |
Presentation of Fontconfig Resistance
There is a difference on an Intel GPU. fc-match output Terminal Output of QML apps |
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I started to doubt if this bug is actually in Kirigami. Today I installed Libreoffice-QT and it also has this problem, but only in the menus and tooltips. Can reproduce. In my case, turning off anti-aliasing doesn't seem to affect *anything*. Seems related to Bug 431428, but I don't understand how fontconfig files work well enough to triage any further. I doubt this is related to Kirigami. It's more likely to be an issue with the way the distro's fontconfig interacts with the settings in the Fonts KCM. Moving there. (In reply to Nate Graham from comment #2) > I doubt this is related to Kirigami. It's more likely to be an issue with > the way the distro's fontconfig interacts with the settings in the Fonts > KCM. Moving there. To test the interaction, I suggest to implement an option which clears the current KCM font configuration and keeps the options undeclared, which would let the inherited system configuration do its job. This would show in which direction the bug is hidden. If the issue persists, it would indicate a problem with Fontconfig parsing or rendering by a library or a framework. If the issue disappears, it would indicate an actual KCM interaction problem. Created attachment 135159 [details]
There is a difference on an Intel GPU.
When I deployed a new system to an old laptop, with Intel hardware platform, I discovered the bug is not as severe on that hardware. So far, it appears only in the Settings applications. The rest of the few applications that are installed there are properly rendering the text.
It is a production computer, so I did not have a chance to test it yet. What tests could I do anyway?
Can people who are affected paste the output of `fc-match -v`? Created attachment 135425 [details]
fc-match output
Thanks. Here's the important bit:
> antialias: False(w)
So it looks like our KCM is doing the right thing, but this setting isn't being respected for some reason. Based on your screenshot, it looks like QTWidgets-based apps and UI controls are respecting the setting, but System Settings--which uses QML--is not. Also based on that screenshot, it looks like your QML theming is not set up properly. The Fonts KCM doesn't look like how it's supposed to. Are you missing the QQC2 desktop theme package? Do you have the qt5ct package installed? Basically I wonder if you're missing a piece that reads that setting for QML software.
I am "dumb" user of NixOS. I had installed the KDE "service" which pulled in the Plasma Desktop. QT5CT was not installed. When running the program, it warns about QT_QPA_PLATFORMTHEME being not set. The installation of this program did not change font rendering even after a reboot. I am not touching any of the settings in qt5ct because I do not know what I am doing with those changes. Yeah, you *don't* want qt5ct to be installed. :) How about the qqc2-desktop-theme package? Not sure what it would be called in nixos. Declaration of kdeFrameworks.qqc2-desktop-style did not change anything, it seems it is already part of the dependency chain for KDE. Hmm that's odd. Well *something* is causing your QML-based apps to have the wrong appearance. Those UI controls in the font KCM should look the same as the text fields, checkboxes, spinboxes in KDE apps. The appearance is visibly wrong in your screenshot. Unfortunately I don't know enough about NixOS packaging to help further. Any chance you could ask for help in a distro-specific venue? I'm willing to bet that the font hinting will start working once your desktop QML theming is sorted out. I have confirmed now, that there are actually two bugs related to Fontconfig. I used to have the following option be unset - meaning it was in the default state, "radeon". https://search.nixos.org/options?channel=20.09&show=services.xserver.videoDrivers&from=0&size=50&sort=relevance&query=videoDrivers I had tried "modesetting" first, it resulted in no change. But when I set it to "amdgpu", only the Settings application is broken. All the other applications like Konsole or Kmail render fonts correctly. When you were writing about the theming, did you have the Settings application specifically in mind? Yes, but it would affect other desktop apps with QML user interfaces, such as Discover, Elisa, or Plasma System Monitor, NeoChat. I would expect that you would see the same anti-aliases text and inappropriately-themed widgets in and all of those apps too. Can you confirm? Created attachment 135428 [details]
Terminal Output of QML apps
Here is the terminal output of the Settings app and the Elisa app. There are some warnings which may or may not be relevant.
With regards to the theming, I have no clue what to do. Am I supposed to find a system package with the correct theme or something?
I don't know either; it's distro-specific. That's what I was recommending asking in a NixOS-specific venue. Hopefully the people there can help. Thank you. I will put it on a back burner for a while. There are other things that I need to get done. Maybe someone else will be able to provide better insight in the meantime. All I could do is some blind package installations in hopes of finding a missing link. Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone! That is not a bug, i say. The fontset is only if the kde used Application doesnt uses another font. So its all like it should be. |
Created attachment 134907 [details] Presentation of Fontconfig Resistance I have seen this problem for a couple of version now. Regardless of distribution or configuration, many of the KDE applications enforce their own fontconfig. In my previous, already discarded installation, even the system wide Fontconfig was ignored. The attached screenshot shows it all. The AA is in the disabled position, my GTK based browser, KWin and the Plasma Shell are properly aliased, but the Settings Manager is still smoothed. My desire is to have no font antialiasing, because my eyes can't focus properly on the blurry curves. The reproduction is as easy as unchecking the antialiasing button and applying the change.