I have this EXACTLY same problem: Text not visible in Qt applications, I tried the steps in the answer that are maked as “solution” but it didn’t work for me, no matter what theme I chose in Kvantum, the problem is the same, when I select some light theme, the problem diminishes, but the font is still having a problem. I also tried to change de presets of Kvantum as it listed here: Some qt based applications are showing theming problem as a solution, but nothing happens either.
So, I tried another solution listed here: How to change weird application background color?, so I installed qt5ct as soon as I open the program, it says it is not configured correctly, the message is:
Please remove the ’QT_STLYE_OVERRIDE'
environment variable (current value: kvantum).
The environment variable QT_QPA_PLATAFORMTHEME
is not set correctly, (current value: gnome, required value: qt5ct) tried to change the theme and absolutely nothing happens again.
I don’t know if this has anything to do with it, but the font scaling factor in gnome I left it set to 0.92, figured that might cause some problem, so I tried 1.00 and restarted the system, but the problem persisted, I tried to do this while changed the theme too and I didn’t have any success.
inxi -Fxz
System:
Kernel: 5.10.59-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
Desktop: GNOME 40.3 Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Desktop Mobo: ASUSTeK model: PRIME B450M-GAMING/BR v: Rev X.0x
serial: <filter> UEFI: American Megatrends v: 2006 date: 11/13/2019
CPU:
Info: 6-Core model: AMD Ryzen 5 2600 bits: 64 type: MT MCP arch: Zen+
rev: 2 cache: L2: 3 MiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
bogomips: 81467
Speed: 1729 MHz min/max: 1550/3400 MHz boost: enabled Core speeds (MHz):
1: 1729 2: 3742 3: 1373 4: 1375 5: 1586 6: 1372 7: 1375 8: 1375 9: 1729
10: 3770 11: 1580 12: 1374
Graphics:
Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
vendor: XFX Pine driver: amdgpu v: kernel bus-ID: 08:00.0
Device-2: A4Tech REDRAGON Live Camera type: USB
driver: snd-usb-audio,uvcvideo bus-ID: 3-2:2
Display: x11 server: X.Org 1.20.13 driver: loaded: amdgpu,ati
unloaded: modesetting resolution: 1920x1080~70Hz
OpenGL: renderer: Radeon RX 570 Series (POLARIS10 DRM 3.40.0
5.10.59-1-MANJARO LLVM 12.0.1)
v: 4.6 Mesa 21.1.6 direct render: Yes
Audio:
Device-1: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
vendor: XFX Pine driver: snd_hda_intel v: kernel bus-ID: 08:00.1
Device-2: AMD Family 17h HD Audio vendor: ASUSTeK driver: snd_hda_intel
v: kernel bus-ID: 0a:00.3
Device-3: A4Tech REDRAGON Live Camera type: USB
driver: snd-usb-audio,uvcvideo bus-ID: 3-2:2
Sound Server-1: ALSA v: k5.10.59-1-MANJARO running: yes
Sound Server-2: JACK v: 1.9.19 running: no
Sound Server-3: PulseAudio v: 15.0 running: yes
Sound Server-4: PipeWire v: 0.3.33 running: yes
Network:
Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
vendor: ASUSTeK PRIME B450M-A driver: r8169 v: kernel port: f000
bus-ID: 07:00.0
IF: enp7s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives:
Local Storage: total: 447.13 GiB used: 112.86 GiB (25.2%)
ID-1: /dev/sda vendor: Kingston model: SA400S37480G size: 447.13 GiB
Partition:
ID-1: / size: 48.97 GiB used: 37.94 GiB (77.5%) fs: ext4 dev: /dev/sda2
ID-2: /boot/efi size: 269.5 MiB used: 312 KiB (0.1%) fs: vfat
dev: /dev/sda1
ID-3: /home size: 389.64 GiB used: 74.92 GiB (19.2%) fs: ext4
dev: /dev/sda3
Swap:
ID-1: swap-1 type: file size: 1024 MiB used: 12.5 MiB (1.2%)
file: /swapfile1
Sensors:
System Temperatures: cpu: 45.8 C mobo: N/A gpu: amdgpu temp: 41.0 C
Fan Speeds (RPM): N/A gpu: amdgpu fan: 1112
Info:
Processes: 334 Uptime: 2h 58m Memory: 15.62 GiB used: 3.23 GiB (20.7%)
Init: systemd Compilers: gcc: 11.1.0 clang: 12.0.1 Packages: 1304
Shell: Zsh v: 5.8 inxi: 3.3.06