Nixpkgs: Theme is broken on several tabs of systemsettings5

Created on 10 Feb 2020 · 14Comments · Source: NixOS/nixpkgs

Describe the bug
On the Plasma 5 desktop, theme is broken on several tabs of systemsettings5. This happens on both plasma desktop 5.16.5 and 5.17.5

To Reproduce
Steps to reproduce the behavior:

Launch System settings
Switch to the "Display and Monitor" tab
Notice the broken theme:

Expected behavior
Theme should work properly

Additional context
If run from the terminal, the following log is displayed when switching the tab:

org.kde.kcoreaddons: Error loading plugin "kcm_kscreen" "The shared library was not found." 
Plugin search paths are ("/nix/store/dkm6jsa0apc7vlpdkslpvsxw1qr7kxh2-python3-3.7.6/lib/qt-5.12.6/plugins", "/run/wrappers/lib/qt-5.12.6/plugins", "/home/kj/.nix-profile/lib/qt-5.12.6/plugins", "/etc/profiles/per-user/kj/lib/qt-5.12.6/plugins", "/nix/var/nix/profiles/default/lib/qt-5.12.6/plugins", "/run/current-system/sw/lib/qt-5.12.6/plugins", "/nix/store/p4vbc0aqsj22f38fniixm0mc9binmal6-systemsettings-5.17.5-bin/lib/qt-5.12.6/plugins", "/nix/store/5h2d5lmhxy4b5ad6h41y8gxa5rd20q4a-plasma-workspace-5.17.5/lib/qt-5.12.6/plugins", "/nix/store/pwkk4w00kvddfyzdv9g0z0531mjv6ddj-qtlocation-5.12.6-bin/lib/qt-5.12.6/plugins", "/nix/store/kwxxwfd3vyz9aw16wyi031ll776rr7hx-libkscreen-5.17.5/lib/qt-5.12.6/plugins", "/nix/store/n1xfvr02f5l81gjap4v51jqc7dc7y8jp-kwin-5.17.5-bin/lib/qt-5.12.6/plugins", "/nix/store/rpy458gzc6rpgszwi1hpinsrv3yr3p6f-breeze-qt5-5.17.5-bin/lib/qt-5.12.6/plugins", "/nix/store/9rm257fgzpb5nhf2swhqvmh15yb4zbg1-frameworkintegration-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/3kfyqzz0chffhrlfcd3z0y03624z57aa-qtsensors-5.12.6-bin/lib/qt-5.12.6/plugins", "/nix/store/sprs2s1m8xgqf4kspl5pnwmfxf3ll0mw-ktexteditor-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/28chnah4xmkb1j9mb8b6m0cpl65qdys7-kscreenlocker-5.17.5/lib/qt-5.12.6/plugins", "/nix/store/jqnydkyplv1s0l7sqavh6qk3g3ay5lpn-plasma-framework-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/wkfp1h7xja24gw5y71ixmsj0y7zq1vic-kdelibs4support-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/94wk9psqhasi9wysh96abdxnqhq08bzc-kemoticons-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/fhi739yhv9bapk09a071pi2gips3x6vy-kplotting-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/462sx9hz9bij1piwbdqbj04fiaz43sw9-baloo-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/krphqcq0dv1h9psa4qwgr0lbxy6r19k3-kidletime-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/b8jwp7i8hrbdkrzd95cnv7vm0w4h3rk1-kfilemetadata-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/17j1xi89yz969vq0nh58w7xzfjdp3l64-qtmultimedia-5.12.6-bin/lib/qt-5.12.6/plugins", "/nix/store/vpclqcmcwsgxwsw2nj4d779xqva6i6i2-khtml-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/0yh5jm2488m40b4r4iwdvmgwdc05dnsq-kio-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/z2l2h5idnn45ybbmpkgbnqy43jai0ni2-phonon-4.11.1/lib/qt-5.12.6/plugins", "/nix/store/25acay6sf1nc7dcal25gb9pqr9d3rp3z-kxmlgui-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/sgpsgpwkzkz61rcc5f5jlrjdy3fa37hi-ktextwidgets-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/i4kb53jjn7g1a9cbs96944mfw75igyra-kcompletion-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/gjhx2ng2ggsw9lbihk59l2ynvr1b8q14-sonnet-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/zwx96j7gllhckvran7ab2fqcdxn96fv4-kiconthemes-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/6m98b8nkyvcy19i1jmzha3rf45s65wnh-kitemviews-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/3vqwlbm2wl90vy91ky11wnvdmzabbv6r-kglobalaccel-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/xchw8xyppk5q750kfbaic52zq6d5ll1g-kwindowsystem-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/zcnjc2dybpkdhiskgmspyk2ajd89asax-kguiaddons-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/4pcp8z5hfdhs46gf1si5wpiqshxg86wb-kwidgetsaddons-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/1v8ja8988gk5p5m91nnyi27pc622521z-kauth-5.66.0/lib/qt-5.12.6/plugins", "/nix/store/09v7c5gn755varmy8nm5vi1r556dkpyk-kconfigwidgets-5.66.0-dev/lib/qt-5.12.6/plugins", "/nix/store/gsrc9z7jls62kgwhyh0xxdvlb30bsysf-ki18n-5.66.0-bin/lib/qt-5.12.6/plugins", "/nix/store/pfsm8mmw5vi2b7xfavlkawl9yqal71ak-qtwayland-5.12.6-bin/lib/qt-5.12.6/plugins", "/nix/store/rp9zgzm1s5bw8545mhyihmksaxc9zfyv-qtdeclarative-5.12.6-bin/lib/qt-5.12.6/plugins", "/nix/store/55arwwspz5sjx2qc65wy66i6kkazrd74-qtsvg-5.12.6-bin/lib/qt-5.12.6/plugins", "/nix/store/6vypqvbkj9jwf4lrjmgm3p8s2xn4addp-qtbase-5.12.6-bin/lib/qt-5.12.6/plugins", "/nix/store/gbbgnr20a3wia424qrd5rrp6630pn75k-fcitx-with-plugins-4.2.9.6/lib/qt4/plugins", "/nix/store/p4vbc0aqsj22f38fniixm0mc9binmal6-systemsettings-5.17.5-bin/bin") 
The environment variable QT_PLUGIN_PATH might be not correctly set
QQmlEngine::setContextForObject(): Object already has a QQmlContext
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/Screen.qml:50: TypeError: Value is null and could not be converted to an object
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/main.qml:28: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/main.qml:27: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/Screen.qml:48: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/Screen.qml:59: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/Screen.qml:57: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/main.qml:116: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/main.qml:116: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/Screen.qml:48: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/main.qml:116: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/OutputPanel.qml:93:12: QML RotationButton: Binding loop detected for property "height"
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/OutputPanel.qml:90:12: QML RotationButton: Binding loop detected for property "height"
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/OutputPanel.qml:87:12: QML RotationButton: Binding loop detected for property "height"
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/OutputPanel.qml:84:12: QML RotationButton: Binding loop detected for property "height"
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/Output.qml:80: ReferenceError: units is not defined
file:///nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/share/kpackage/kcms/kcm_kscreen/contents/ui/Output.qml:90: ReferenceError: units is not defined

Metadata

[root@DCHORUS-LEGION-NIXOS:~]# nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 5.4.17, NixOS, 20.03pre212208.8130f3c1c2b (Markhor)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.2`
 - channels(root): `"nixos-20.03pre212208.8130f3c1c2b"`
 - channels(kj): `""`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

bug qkde

Source

y-usuzumi

👍3 👀1

All 14 comments

It's because the proper theme is not selected for the qtquickcontrol2 parts of settings. The same problem applies to all the kirigami based applications (discover as an example).

The workaround:

QT_QUICK_CONTROLS_STYLE=plasma systemsettings5

However, when I do this some parts of the settings application will segfault.

You can also pick another theme from this list - https://doc.qt.io/qt-5/qtquickcontrols2-styles.html

imagine looks decent:

QT_QUICK_CONTROLS_STYLE=imagine systemsettings5

But in any case, it's a problem that plasma doesn't set this correctly and of course that we get segfaults when using the proper theme.

Cc: @ttuegel

peterhoeg on 13 Feb 2020

👍1

What you are seeing is technically not a broken theme. It's the default qtquickcontrols2 theme.

peterhoeg on 13 Feb 2020

Switching to another style didn't really help here - KCMs are still utterly broken (e.g. display KCM doesn't load the QML for positioning the displays).

According to nix-env -q, I have 0 pkgs in my environment, so nothing there should mess with me here...

Seeing The environment variable QT_PLUGIN_PATH might be not correctly set reminds me quite a bit of #27050
My $QT_PLUGIN_PATH contains 138 items - I wonder whether we're hitting some limit here which might cause this?

eliasp on 16 Feb 2020

There are a few things which strike me as weird...
kcmshell5 kscreen complains about not being able to find kcm_kscreen.so and hints at a probably misconfigured $QT_PLUGIN_PATH environment variable, but the paths displayed after the error message don't seem to originate from the values in $QT_PLUGIN_PATH.

kcmshell5 kscreen seems to be right, that none of the printed paths contains kcm_kscreen.so:

$ kcmshell5 kscreen 1>/dev/null 2>&1 | grep 'Plugin search paths are' | cut -d\( -f2 | cut -d\) -f1 | sed -e 's|, |\n|g' | sed -e 's|^"||g' -e 's|"$||g' | xargs -I {} find {}/ -type f -name kcm_kscreen.so
find: ‘/run/wrappers/lib/qt-5.12.6/plugins/’: No such file or directory
find: ‘/home/eliasp/.nix-profile/lib/qt-5.12.6/plugins/’: No such file or directory
find: ‘/etc/profiles/per-user/eliasp/lib/qt-5.12.6/plugins/’: No such file or directory
find: ‘/nix/var/nix/profiles/default/lib/qt-5.12.6/plugins/’: No such file or directory

The same goes for $QT_PLUGIN_PATH - none of the entries seems to provide kcm_kscreen.so:

$ echo $QT_PLUGIN_PATH | sed 's|:|\n|g' | sort | xargs -I {} find {}/ -type f -name kcm_kscreen.so
find: ‘/etc/profiles/per-user/eliasp/lib/kde4/plugins/’: No such file or directory
find: ‘/etc/profiles/per-user/eliasp/lib/qt4/plugins/’: No such file or directory
find: ‘/home/eliasp/.nix-profile/lib/kde4/plugins/’: No such file or directory
find: ‘/home/eliasp/.nix-profile/lib/qt4/plugins/’: No such file or directory
find: ‘/nix/var/nix/profiles/default/lib/kde4/plugins/’: No such file or directory
find: ‘/nix/var/nix/profiles/default/lib/qt4/plugins/’: No such file or directory
find: ‘/run/current-system/sw/lib/kde4/plugins/’: No such file or directory
find: ‘/run/current-system/sw/lib/qt4/plugins/’: No such file or directory

Looking at /nix/store, the following possible matches are currently present:

find /nix/store/*-kscreen-*/lib/qt-*/plugins/ -type f -name kcm_kscreen.so  
/nix/store/17iyjhqrgxq63wmzz76vp9q3b9x2lg3p-kscreen-5.16.5/lib/qt-5.12.6/plugins/kcm_kscreen.so
/nix/store/24vyflvrgxi5h5mxlbgcncskmanj1381-kscreen-5.16.5/lib/qt-5.12.6/plugins/kcm_kscreen.so
/nix/store/2jp445v9xr214wgb3rjh4ix1xmy2ysr3-kscreen-5.16.5/lib/qt-5.12.6/plugins/kcm_kscreen.so
/nix/store/53w8y9xj5rvlz9rq5hmlh9alqdcgi69w-kscreen-5.14.5/lib/qt-5.12/plugins/kcm_kscreen.so
/nix/store/5m7zscnx24777xzj9zi26q4pfgplrxhi-kscreen-5.16.5/lib/qt-5.12.3/plugins/kcm_kscreen.so
/nix/store/8a3mwspiivlb6w08srjj4l4517m74f6g-kscreen-5.16.5/lib/qt-5.12.6/plugins/kcm_kscreen.so
/nix/store/djyvdkqxnj8j044lnnwvcixq15qb44k5-kscreen-5.17.5/lib/qt-5.12.6/plugins/kcms/kcm_kscreen.so
/nix/store/f5n1ybbzjrnllfiv8rvmr4z884znxkra-kscreen-5.16.5/lib/qt-5.12.6/plugins/kcm_kscreen.so
/nix/store/i7gilrkxnvmp7g0njg8bv5g9w2g6yic5-kscreen-5.14.5/lib/qt-5.12/plugins/kcm_kscreen.so
/nix/store/k7q9g6l0qd13dbqa0h35ffmwfg11apg2-kscreen-5.16.5/lib/qt-5.12.5/plugins/kcm_kscreen.so
/nix/store/nplwcwlgiw0dmh70qvakqcghvkis1nh4-kscreen-5.14.5/lib/qt-5.12/plugins/kcm_kscreen.so
/nix/store/rlm403l4qnb2y4cwfrnjvcvyga2vy5w6-kscreen-5.16.5/lib/qt-5.12.6/plugins/kcm_kscreen.so
/nix/store/wcixgs1y0xkap5am9k47jq1zjv2bqqnr-kscreen-5.16.5/lib/qt-5.12.5/plugins/kcm_kscreen.so
/nix/store/xw2avh713pa6gxpfpz4mhq8sgid5cylf-kscreen-5.14.5/lib/qt-5.12/plugins/kcm_kscreen.so
/nix/store/y34p9zp8q677qs5n26y9ax0kxba20ypj-kscreen-5.16.5/lib/qt-5.12.6/plugins/kcm_kscreen.so
/nix/store/y97p4yqkxyyc0yqlc1n2cpwcw22z4n0h-kscreen-5.14.5/lib/qt-5.12/plugins/kcm_kscreen.so

Where do the outdated paths in kcmshell5 and $QT_PLUGIN_PATH come from? Some of those don't even exist and nothing in my user's profile seems to add them!
Why is there a mismatch between the path built-in to kcmshell5 and $QT_PLUGIN_PATH?

eliasp on 16 Feb 2020

…and it looks like we're actually dealing with 2 separate issues here and you were right @peterhoeg - trying to inject a correct path into QT_PLUGIN_PATHS silences the error msgs about not being able to find kcm_kscreen.so, but the rendering issues persist:

QT_PLUGIN_PATH=$(dirname $(nix eval --raw nixpkgs.kscreen)/lib/qt-5*/plugins/kcms/kcm_kscreen.so):${QT_PLUGIN_PATH} kcmshell5 kscreen

eliasp on 16 Feb 2020

But in any case, it's a problem that plasma doesn't set this correctly and of course that we get segfaults when using the proper theme.

@peterhoeg Do you have any idea how Plasma is supposed to set this? I don't see reference to QT_QUICK_CONTROLS_STYLE in any obvious place. The segfault with the theme set is likely due to some plugin mismatch.

ttuegel on 16 Feb 2020

The segfault with the theme set is likely due to some plugin mismatch.

This part is easy: we haven't actually packaged kdeFrameworks.qqc2-desktop-style, as required by plasma-desktop and others!

ttuegel on 17 Feb 2020

It looks like we have 3 issues:

systemsettings crashes due to missing plugins, ie: incorrect QT_PLUGIN_PATH
entries in QT_PLUGIN_PATH are duplicated

$ echo $QT_PLUGIN_PATH | tr ':' "\n" | wc -l
90

$ echo $QT_PLUGIN_PATH | tr ':' "\n" | sort -u | wc -l
49

qqc2-desktop is not packaged (and used) to provide default look and feel of qtquick2 components: https://www.archlinux.org/packages/extra/x86_64/qqc2-desktop-style/ But despite showing on the arch package as being a dependency of plasma-integration, our plasma-integration package doesn't use it for anything. See the wip pr.

peterhoeg on 19 Feb 2020

Cherry-picking the commit from #80521 and setting QT_QUICK_CONTROLS_STYLE=Plasma makes it work for me.

Why we have to set that variable, I cannot say. If somebody else can confirm that it fixes it for them, we can fix the nixos module as a workaround.

peterhoeg on 14 May 2020