It's written to ~/.config/fontconfig/fonts.conf and it certainly is used. I test by re-launching systemsettings. If I remove the file, fonts are rendered using the system default (anti-aliased). Saving my settings creates this file and uses the contents (anti-alias exclude range + full hinting) on the next launch.
** Attachment added: "fonts.conf" https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/2017573/+attachment/5668239/+files/fonts.conf -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to fontconfig in Ubuntu. https://bugs.launchpad.net/bugs/2017573 Title: Font hinting broken on 23.04 Status in fontconfig package in Ubuntu: Incomplete Bug description: Just upgraded my laptops to Kubuntu 23.04 Lunar Lobster and hinting for all non-commercial fonts seems broken. I used to have decent if not perfect hinting on Ubuntu and Ubuntu Mono font, but now the only fonts that still hint correctly are Microsoft's Verdana and Tahoma etc. Not sure whether the devide is exactly along this line, but it stands out. Tried regenerating font cache (fc-cache -rv) but that didn't help. Operating System: Kubuntu 23.04 KDE Plasma Version: 5.27.4 KDE Frameworks Version: 5.104.0 Qt Version: 5.15.8 Kernel Version: 6.3.0 (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ i7-10510U CPU @ 1.80GHz Memory: 31.1 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics Manufacturer: Notebook Product Name: N141CU System Version: Not Applicable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/2017573/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp