Re: Sddm cannot find breeze theme

Am 13.06.25 um 19:57 schrieb dave kohler ([email protected] via
blfs-support Mailing List):
> On Fri, Jun 13, 2025 at 8:58 AM sicarine <
> [email protected]> wrote:
> 
>> (Snipped previous messages for for length)
>>
>> I wanted to give an update on this in case someone searches the mailing
>> list archives in the future.
>>
>> In the last build, I resolved issues with the sddm greeter by symlinking.
>>
>> I rebuilt BLFS from scratch on a much faster computer.
>> This time I went strictly by the book using /opt/kf6 and
>> /opt/qt6 as prefixes. I still ran into the same issue of missing breeze
>> components. So I wanted to find a better solution as I understand
>> that in some cases symlinks generally mask a deeper configuration
>> issue without fundamentally addressing the problem.
>>
>> Looking at the git repository for sddm, I think I found that the
>> fundamental issue is that sddm appears to use its own environment
>> variables, and so either does not check /etc/profile, or doesn't
>> understand BLFS's added pathappend function (or both).
>>
>> However, /etc/sddm.conf does also allow you to manually set the
>> greeter's environment variables, and so I was able to manually set
>> $PATH, $XDG_DATA_DIRS, $XDG_CONFIG_DIRS, $QML2_IMPORT_PATH,
>> and $QT_PLUGIN_PATH.
>>
>> One symlink seemed to be requited, linking /opt/qt6/include/Plasma
>> to /usr/include/Plasma.
>>
>> That seemed to fix most of the greeter's issues.
>>
>> I am, however, still trying to hunt down why the greeter lacks permissions
>> to allow me to sleep/restart/poweroff, and it's taking a while to
>> narrow down since most resources assume one is using systemd.
>>
>> Being new at this, I still cannot rule out that I've made some dumb
>> error on my part twice, however one bug I found with the blfs book is
>> in the sddm-0.21.0 instruction:
>>
>>> In order to see the theme without leaving the session, issue:
>>> sddm-greeter --test-mode --theme <theme path>
>>
>> I believe "sddm-greeter" should be "sddm-greeter-qt6" in a QT6-only build
>> like BLFS.
>>
>> Cheers,
>> Sicarine
>> --
>> http://lists.linuxfromscratch.org/sympa/info/blfs-support
>> Unsubscribe: See the above information page
>>
> 
> Thank you for this update. It fits my experience using the 12.3 BLFS
> guidance with the goal of getting KDE/Plasma/Wayland running.
> Initially I could get KDE Apps like Kate, Dolphin, and Konsole working only
> under TWM and Xorg. In this environment if I clicked on a text file in
> Dolphin, the
> context menu offered me the option to launch a Kate edit session of the
> text. While this worked the Xorg logon window recorded that each of the 3
> functions defined in the BLFS, path_append, prepend,etc. were reported as
> invalid and ignored by kio. In this case however the Kate edit sessions
> worked. I could never determine what problem was under this behavior. This
> might be a clue for others since it seems to duplicate the messages you got
> in the context of SDDM analysis.
> 
> When I moved on to SDDM with some symlinks as you had suggested, I was able
> to get SDDM working with XWayland, but there were a number of problems in
> that environment. In particular, an obvious one was that the KDE Help
> center, aka plasma-welcome, was broken on one of its panels and the panel
> displayed the info that the FORM: AboutKDEHelp was not defined. This is the
> QML Form that was needed for this particular panel of the plasma-welcome
> app.
> 
> I have had lots of experience with other graphical UI systems over my
> career, but retired when QT5 was just becoming popular. So I had to take a
> while to educate myself on Qt6 and the QML portion of it. Early this week I
> realized that the missing QML Form was added in Kirigami-addons.1.5 in
> October 2024, and was a requirement for at least this one portion of
> Plasma. The version recommended in the 12.3 BLFS book is Kirigami-addons
> 1.4. Fetching the update to Kirigami-addons, and building it completely
> cured the problem with plasma-welcome.  I have not yet attempted to rebuild
> other parts of the KF6 or Plasma files to see of this fixes anything else.
> I will note that the current dev version of the BLFS book seems to have
> gone on to Kirigami-addons 1.7, So this specific problem should not appear
> for anyone using more recent versions of the dev BLFS book.
> 
> At this time all my attempts and research have failed to explain why I
> cannot get SDDM to logon a user in the Plasma/Wayland mode. I was able to
> find several log files that suggested that I needed something like the
> QML2_IMPORT_PATH and others that you mentioned. Whenever I attempt to logon
> in this mode, the screen goes black and logs show that there is a failure
> regarding one or more of these symbols utilized by SDDM. SDDM always goes
> back to the greeter/logon screen. I had given up on solving this problem
> until I saw today's post. I had not yet thought to explore the sddm.conf
> file in my environment.
Take a look at the example-config, in particular the [Wayland] and [X11]
sections:
sddm --example-config

HTH.

Rainer

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