[SOLVED] Qt6/qt6ct font weirdness

McLink · Last edited by McLink on Sat Sep 14, 2024 12:17 pm; edited 3 times in total

Fixed by manually editing ~/.config/qt6ct/qt6ct.conf and entering valid font names in the appropriate fields there.

For some reason, Qt6 does not seem to want to use sensible font settings. Under Qt5, I can use x11-misc/qt5ct to set the font just fine, however, when I try the same with gui-apps/qt6ct, the font options do not show a font family, and trying to change the value causes a segfault. The message "QFont::fromString: Invalid description ',12,-1,5,400,0,0,0,0,0,0,0,0,0,0,1'" repeats a few times when I open qt6ct. The segfault seems to originate in QFontDialogPrivate::updateFamilies().

An example of the differences between qt5ct and qt6ct: [removed]
Clicking either of the "..." buttons in qt6ct is what causes it crash.

emerge --info: [removed]
eselect fontconfig list: [removed]

Any ideas?
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Weezer · n00b Joined: 19 Apr 2024 Posts: 19

I was unable to view your imjur file, however, I would ask if you set:

QT_QPA_PLATFORMTHEME="qt6ct" in your /etc/environment file?

Just something to check. I've no font issues to speak of otherwise.

The Main Man · Posted: Sat Sep 14, 2024 11:16 am Post subject:

I am using kvantum, no issues there, but make sure you set this variable, otherwise it's a pain.

McLink · Posted: Sat Sep 14, 2024 11:58 am Post subject:

I've added QT_QPA_PLATFORMTHEME="qt6ct" (it was still set to qt5ct). No difference.
If I set QT_STYLE_OVERRIDE to anything, qt6ct warns me to remove it.

In any case, I think this is more a case of Qt6 somehow messing up when finding out the available fonts than anything to do with the theme.

EDIT: It was actually just an empty value that had somehow sneaked into ~/.config/qt6ct. Fixed by manually editing ~/.config/qt6ct/qt6ct.conf and entering valid font names in the appropriate fields there.
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