Same thing happened to me about a year ago with Qt 5.14. Thanks to asturm, issue was resolved. Here's the link on the forums: https://forums.gentoo.org/viewtopic-t-1107004.html However, with the release of Qt 5.15.2, this issue appeared again. Exactly same sympthoms, but the patch proposed by asturm doesn't work with this version. Downgrading to Qt 5.15.1-r1 helps. Reproducible: Always Steps to Reproduce: 1. Upgrade installed dev-qt packages (including dev-qt/qtgui) to 5.15.2 2. Launch any KDE app (e.g. Dolphin, Kwrite or System Settings) 3. Behold the fonts Actual Results: Nasty upscaled and blurry fonts Expected Results: Cute tiny and properly scaled fonts emerge --info Portage 3.0.12 (python 3.7.9-final-0, default/linux/amd64/17.1/desktop/plasma/systemd, gcc-10.2.0, glibc-2.32-r6, 5.10.2-gentoo x86_64) ================================================================= System uname: Linux-5.10.2-gentoo-x86_64-AMD_Ryzen_7_2700X_Eight-Core_Processor-with-gentoo-2.7 KiB Mem: 32797104 total, 21970700 free KiB Swap: 2097148 total, 2097148 free Timestamp of repository gentoo: Thu, 24 Dec 2020 20:00:01 +0000 Head commit of repository gentoo: 4696346279d3c808853ef5604bfdf42e098b7b86 Head commit of repository flatpak-overlay: 4bf9a7815ca9361f86459c8a8e9bc403e3721704 sh bash 5.1_p4 ld GNU ld (Gentoo 2.35.1 p2) 2.35.1 app-shells/bash: 5.1_p4::gentoo dev-java/java-config: 2.3.1::gentoo dev-lang/perl: 5.30.3-r1::gentoo dev-lang/python: 2.7.18-r5::gentoo, 3.7.9-r1::gentoo, 3.8.7::gentoo, 3.9.1::gentoo dev-util/cmake: 3.19.2::gentoo dev-util/pkgconfig: 0.29.2::gentoo sys-apps/baselayout: 2.7-r1::gentoo sys-apps/sandbox: 2.20::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r5::gentoo sys-devel/automake: 1.13.4-r2::gentoo, 1.16.3-r1::gentoo sys-devel/binutils: 2.35.1-r1::gentoo sys-devel/gcc: 8.4.0-r2::gentoo, 9.3.0-r2::gentoo, 10.2.0-r4::gentoo sys-devel/gcc-config: 2.3.2-r1::gentoo sys-devel/libtool: 2.4.6-r6::gentoo sys-devel/make: 4.3::gentoo sys-kernel/linux-headers: 5.10::gentoo (virtual/os-headers) sys-libs/glibc: 2.32-r6::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 sync-rsync-verify-jobs: 1 sync-rsync-verify-metamanifest: yes sync-rsync-verify-max-age: 24 sync-rsync-extra-opts: mva location: /var/lib/layman/mva masters: gentoo priority: -50 my location: /usr/local/my masters: gentoo priority: 0 brave-overlay location: /var/lib/layman/brave-overlay masters: gentoo priority: 50 cg location: /var/lib/layman/cg masters: gentoo priority: 50 deadbeef-overlay location: /var/lib/layman/deadbeef-overlay masters: gentoo priority: 50 flatpak-overlay location: /var/lib/flatpak-overlay sync-type: git sync-uri: https://github.com/fosero/flatpak-overlay.git masters: gentoo priority: 50 hamper-overlay location: /var/lib/layman/hamper-overlay masters: gentoo priority: 50 jacendi-overlay location: /var/lib/layman/jacendi-overlay masters: gentoo priority: 50 jorgicio location: /var/lib/layman/jorgicio masters: gentoo priority: 50 kde location: /var/lib/layman/kde masters: gentoo priority: 50 linxon location: /var/lib/layman/linxon masters: gentoo priority: 50 snapd location: /var/lib/layman/snapd masters: gentoo priority: 50 steam-overlay location: /var/lib/layman/steam-overlay masters: gentoo priority: 50 ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -mtune=native -O2 -pipe -fomit-frame-pointer" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--with-bdeps=y --quiet-build=n" ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync metadata-transfer multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="ru_RU.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="ru en" MAKEOPTS="-j14" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/tmp" USE="10bit X a52 aac acl acpi activities aes aften alsa amd64 amr ass audio bash-completion branding bzip2 cairo cdda cdr clang cleartype crypt css cups cxx dav1d dbus declarative device-mapper djvu dri dts dv dvd dvdr efi egl emoji encode exif faac faad fam fat fdk ffmpeg firmware-loader flac fontconfig gd gif gles gpm gui gzip heif http2 iconv icu id3tag ieee1394 imagemagick ipv6 jit jpeg kde keymap ladspa lame lash lcms libaom libass libglvnd libnotify libtirpc lm_sensors lzma lzo mad matroska midi mng modules mp3 mp4 mpeg mplayer mtp mudflap multilib ncurses nls nptl ntfs nvidia ogg opengl openmp opus pam pango pcre pdf phonon pie plasma png policykit popcnt ppds pppd pulseaudio qml qt5 quicktime rar raw readline scanner sdl seccomp session split-usr ssl ssp startup-notification svc svg sysfs system-binutils system-boost system-cairo system-clang system-ffmpeg system-harfbuzz system-icu system-jpeg system-libevent system-libvpx system-llvm system-sql systemd tcpd telegram-patches theora threads tiff toolame truetype twolame udev udisks unicode upower usb vaapi vdpau vorbis vpx wav wavpack wayland webp widgets win32codecs wxwidgets x264 x265 xattr xcb xcomposite xml xorg xscreensaver xulrunner xv xvfb xvid xvmc zip zlib" ABI_X86="64" ADA_TARGET="gnat_2018" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 f16c fma3 mmx mmxext pclmul popcnt sha sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64 pc" INPUT_DEVICES="evdev" KERNEL="linux" L10N="ru en" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2 php7-3 php7-4" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_7" PYTHON_TARGETS="python3_7 python3_8 python3_9" RUBY_TARGETS="ruby26 ruby27" USERLAND="GNU" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CC, CPPFLAGS, CTARGET, CXX, INSTALL_MASK, LC_ALL, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
Created attachment 679470 [details] Screenshot of the changes Here you can see the difference. There were no changes in settings etc, just upgrade of those dev-qt packages.
There has been no other report of this kind in Gentoo and I have not seen anything similar on any system of mine. The patch from January went upstream into 5.14.1 and there have been only two commits touching the file since our fix, both are already in 5.15.1: https://github.com/qt/qtbase/commit/e1254f0700bcdc51781468d93ae94a158d18a8df https://github.com/qt/qtbase/commit/8f6ef542ba7050f39eb9c6062871240a1a62ea42 Which means this is a different issue. Please try to reproduce your problem with a fresh test user profile. Then, please go directly to upstream (bugs.kde.org) with as much information as possible, starting with X11 vs. Wayland session behavior, any scaling settings you have in systemsettings, any nondefault settings you made in X11 config, and of course the fact that 5.15.2 behaves differently to 5.15.1.
Thanks, will do that.
