[Pkg-matrix-maintainers] Bug#1073959: Bug#1073959: nheko starts into a grey screen, log warns about missing module org.kde.breeze and DRM_MSM_GEM_INFO

[Marco Mattiolo]

Actual workaround is launching "env QT_QUICK_CONTROLS_STYLE=Universal 
nheko" from terminal. This issue should solve by itself as soon as 
src:qqc2-breeze-style (6.1.0-1, now in experimental) gets into sid/trixie.

[re-posting trying to get layout understood right by BTS]

Hi Jonas,

I think I can now confirm the issue is Breeze, then the bug is not in 
nheko itself.

Launching "env QT_QUICK_CONTROLS_STYLE=Universal nheko" gets to a 
working nheko instance. A bit weird in the colours, but that's kind-of 
expected with this kind of workaround.

Idea came after finding where that "org.kde.breeze" comes from, as it is 
not inside nheko source code: it's plasma-mobile to set that variable 
[1]. A search brought me then to [2] and to the workaround, I guess 
every non-Breeze style listed in that page should work fine, maybe 
looking even better than Universal. Now, where is the bug? That 
environment variable is still set in plasma-mobile on the master 
(Plasma6/KF6/Qt6) branch [3]. So it's supposed to be there, yet nheko is 
not finding it.

My best hypothesis at the moment, that "org.kde.breeze" QQC (Qt Quick 
Controls) style should be supplied by binary package 
qml-module-org-kde-qqc2breezestyle (source qqc2-breeze-style) that is 
stil at 5.27.11-1 version at the moment in Debian [4]. I see the version 
of that package in trixie still build-depends on Qt5/KF5, so that's 
likely conflicting with nheko already depending on Qt6.

Please let me know if it's OK for you to keep this bug assigned to nheko 
until the situation is fixed, so that it's easier for anyone else to 
find the workaround.

Kind regards

Marco

[1] 
https://codesearch.debian.net/show?file=plasma-mobile_5.27.10-1%2Fbin%2Fstartplasmamobile.in&line=15

[2] https://doc.qt.io/qt-6/qtquickcontrols-styles.html

[3] 
https://invent.kde.org/plasma/plasma-mobile/-/blob/master/bin/startplasmamobile.in?ref_type=heads#L14

[4] https://packages.debian.org/source/trixie/qqc2-breeze-style
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