Appearance issue on XFCE (with QT ?)

[nam1962]

Hi, I suppose this is QT as some of my apps show in unreadable dark mode.

I’m on XFCE and don’t understand the alert as:

➜  ~ cat ~/.zshrc | grep -i qt
unset QT_STYLE_OVERRIDE
export QT_QPA_PLATFORMTHEME=qt5ct
➜  ~ echo $QT_STYLE_OVERRIDE  
echo $QT_QPA_PLATFORMTHEME

qt5ct
➜  ~ 

[Nachlese]

Did Xfce4 come with zsh as the default?
I’m not sure anymore, I forgot.
If that was the case, I reverted it to bash.

I do have ~/.zshrc - but there is nothing about QT_ in it

That is all in ~/.profile

ps:
I can read french - but I don’t understand it
although I think I get the gist of what is in your screenshot.

current contents of my ~/.profile

export EDITOR=/usr/bin/nano
export QT_QPA_PLATFORMTHEME="qt5ct"
export QT_AUTO_SCREEN_SCALE_FACTOR=0
export GTK2_RC_FILES="$HOME/.gtkrc-2.0"

[soundofthunder]

@nam1962

I’m on XFCE and don’t understand the alert as:

A quick guess (and, it’s only a guess) is that you may need to reference qt6ct instead of qt5ct… in the event that qt6ct is now installed.

pacman -Qi qt6ct

[nikgnomic]

@nikgnomic

After recent update, system is not applying configuration settings in ~/.profile including: export QT_QPA_PLATFORMTHEME="qt5ct" for QT theme

For zsh try this:

@pheiduck

$ sudo pacman -S kvantum-qt5

solved it but highlight color is blue instead of green

[nam1962]

Thank you for caring

Yes bash is the original default, I have zsh since my Le Wagon courses.
I removed the lines from zshrc

now

➜  ~ cat ~/.profile  
export EDITOR=/usr/bin/nano
export QT_QPA_PLATFORMTHEME="qt5ct"
export QT_AUTO_SCREEN_SCALE_FACTOR=0
export GTK2_RC_FILES="$HOME/.gtkrc-2.0"
export PATH=~/.npm-global/bin:$PATH
➜  ~ 

but

Veuillez supprimer la variable d’environnement QT_STYLE_OVERRIDE (valeur actuelle : gtk+).

La variable d’environnement QT_QPA_PLATFORMTHEME n’est pas définie (valeurs requises : qt5ct ou qt6ct).

when i launch qt5ct

and

➜  ~ LANG=C         pacman -Qi qt6ct
error: package 'qt6ct' was not found
➜  ~ 

I also get

➜  ~ LANG=C  sudo pacman -S kvantum-qt5
error: target not found: kvantum-qt5
➜  ~ 

[Nachlese]

use:
LANG=C and then your command
non-french readers can understand the output then

[D.Dave]

@nam1962

but

Veuillez supprimer la variable d’environnement QT_STYLE_OVERRIDE (valeur actuelle : gtk+).

La variable d’environnement QT_QPA_PLATFORMTHEME n’est pas définie (valeurs requis

Maybe related:

After 2024-02-21 Stable Update ~/.profile file is no longer sourced

This has been the simplest and clean solution for me.

[nam1962]

Ok, corrected where I could

[Nachlese]

the messages say that packages are missing

@nam1962

error: package 'qt6ct' was not found

@nam1962

error: target not found: kvantum-qt5

Are they indeed missing?

[soundofthunder]

@nam1962

➜  ~ LANG=C  sudo pacman -S kvantum-qt5
error: target not found: kvantum-qt5

Try this Instead:

pacman -Qi kvantum
# if really not installed:
sudo pacman -S kvantum

That should install the following packages (if needed):

kwindowsystem5-5.115.0-1
qt5-base-5.15.12+kde+r151-1
qt5-svg-5.15.12+kde+r6-1
qt5-translations-5.15.12-1
qt5-x11extras-5.15.12-1
kvantum-1.0.10-2

[nam1962]

@soundofthunder

pacman -Qi kvantum

➜  ~ LANG=C pacman -Qi kvantum
Name            : kvantum
Version         : 1.0.10-2
Description     : SVG-based theme engine for Qt5/6 (including config tool and extra themes)
Architecture    : x86_64
URL             : https://github.com/tsujan/Kvantum
Licenses        : GPL
Groups          : None
Provides        : None
Depends On      : kwindowsystem5  qt5-svg
Optional Deps   : qt6-svg: Qt6 style [installed]
Required By     : kvantum-manjaro  kvantum-theme-matcha
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 9,02 MiB
Packager        : Antonio Rojas <arojas@archlinux.org>
Build Date      : dim. 01 oct. 2023 09:39:42
Install Date    : sam. 06 avril 2024 05:07:30
Install Reason  : Installed as a dependency for another package
Install Script  : No
Validated By    : Signature

➜  ~ 

[soundofthunder]

It seems to be installed.

[nam1962]

It is !

I also found how to get rid of the qt5ct alert

➜  ~ echo $QT_STYLE_OVERRIDE
echo $QT_QPA_PLATFORMTHEME

qt5ct

but I still have this unreadable dark mode

[banjo]

Your qt5ct screenshot indicates you have not set a kvantum theme. What theme do you use ? Does it support gtk-4.0 ? That is important.
You need a ~/.config/gtk-4.0 folder and symlink the “assets”, “gtk.css” and “gtk-dark.css” from your theme to it:

I use dark theme, so I set qt5ct to kvantum-dark:

In Kvantum Manager you need to choose a theme, in my case it is KvGnomeDark.

Regarding the theme you use, you find a matching kvantum theme or not.

[nam1962]

Wahh ! you did it !
It was indeed a gtk4 theme stuff.
Strange as I didn’t have it and it was functional before my reinstall a few weeks ago.
Thank you all, special praise to @banjo

I downloaded this very light one

Fluent gtk theme

And

For some reasons as myopic aspie I’m not at ease with dark themes anyway, so it’s perfect to me.