Arch Linux upgraded to qt v5.14.0 in mid-to-late December. This QT upgrade seems to have broken some font functionality in Kalarm. It used to be that when kalarm launched, it would pick up all the same font and style settings I have set for all my KDE and QT apps. Now it picks up the style settings, and perhaps even the font name & size too. But the anti-aliased settings are ignored. So even though I disable anti-aliasing everywhere, kalarm still displays the font as anti-aliased. This problem seems to be limited to kalarm, and does not seem to happen with other KDE and QT apps. (If you look at the screenshot at http://darose.net/Screenshot_2020-01-08_16-58-43.png you can see that kalarm renders using anti-aliasing, while kinfocenter and qps do not.) Downgrading all the qt5 packages back down to 5.13.2 eliminates the problem. Arch Linux (kernel 5.4.2) Kalarm 2.13.1 (KDE Apps 19.12.1) qt 5.14.0
FYI, Okular seems to suffer from the same issue. (Though again, most KDE/QT apps do not.)
Looks like this got fixed on Arch due to inclusion of a patch to qtbase: https://code.qt.io/cgit/qt/qtbase.git/patch/?id=b31852c4 https://git.archlinux.org/svntogit/packages.git/commit/trunk?h=packages/qt5-base&id=d8c26ab2af68d469cccad041993f50a6d3f5f30e
Thanks for that information.