Re: Questions about CalDav Syncproblems (three KDE machines + Android)

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From: Markus Feilner <[email protected]>
To: [email protected]
Cc: =?UTF-8?B?Vm9qdMSbY2g=?= Zeisek <[email protected]>
Date: Sat, 28 Mar 2026 09:48:53 +0100
Message-ID: <[email protected]>
Organization: Feilner IT
In-Reply-To: <7246980.jJDZkT8p0M@rusalka>
MIME-Version: 1.0

Vojt=C4=9Bch Thanks so much! Answers inline.=20

Am Freitag, 27. M=C3=A4rz 2026, 17:59:21 Mitteleurop=C3=A4ische Normalzeit =
schrieb=20
Vojt=C4=9Bch Zeisek:
> Hi
>=20
> Dne p=C3=A1tek 27. b=C5=99ezna 2026 10:48:26, st=C5=99edoevropsk=C3=BD st=
andardn=C3=AD =C4=8Das, Markus
>=20
> Feilner napsal(a):
> > Now I set up a fresh Kontact/Korganizer client and added an appointment.
> > Shows up instantly in Radicale Server, on Android App and in Thunderbir=
d.
> > Have been waiting on second KDE desktop for it to show up. Took an
> > akonadictl restart so that the meeting showed up. Reload was not enough.
>=20
> This still looks like some weird settings of sync interval. I'd double cl=
ick
> on the resource in the akonadiconsole and check the refresh interval. Oth=
er
> option could be some issue with authentisation, network or so, but there
> I'd expect slightly different behavior...

That might indeed be ONE of the problems. However, one machine ONLY updated=
 on=20
akonadictl restart, not even after a reboot. I had a start script created t=
o=20
have an up-to-date calendar and a cronjob doing a akonadictl restart hourly=
=2E=20
Since that worked for a while, I guess this might be the right path to look=
=2E=20
Will do.=20

> > Have changed the meeting time to two hours later (on first machine in
> > KDE/Kontact), is displayed correctly instantly on Server and Android and
> > Thunderbird, but not on second KDE desktop.
>=20
> AFAIK KDE doesn't have push notifications, i.e. the changes are synchroni=
zed
> only on the refresh intervals. I thought there was some settings in
> KOrganiser to work with it, something like to sync after every change, but
> I didn't find anything like this now....

Exactly.=20


> > will do some more checks and debugging over the weekend. I also saw
> > that the full ICS export from TB is bigger than that from Kontact, but
> > there may be other reasons for that.
> > I think I'll do a blogpost / article on debugging caldav. :-) Any help
> > appreciated.
>=20
> I'd consider a bug report at <https://bugs.kde.org/> first. :-)

Yeah, will do, once I am sure about things going on. I dont want to bother=
=20
others with my obscure findings and especially not if it all comes down to =
a=20
mistake of mine.=20

Thanks so much!  I already learned a lot in terms of debugging this.=20

> > Have a nice weekend and sorry for spamming (if so)
> >=20
> > Am Freitag, 27. M=C3=A4rz 2026, 10:07:34 Mitteleurop=C3=A4ische
> >=20
> > Normalzeit schrieb Markus Feilner:
> > > Ok, in my radicale Container I can see ics-Files popping up for new
> > > appointments coming in. I can confirm from that that TB and DavX
> > > work as promised. Will test now with Kontact, Akonadi and Merkuro.
> > > I am using the debugger and features of akonadikonsole.
>=20
> Are ICS files some feature of...? Because AFAIK the calendar information
> should be in the Akonadi database (by default), and not as bunch of
> files...?
> > > Am Freitag, 27. M=C3=A4rz 2026, 09:29:58 Mitteleurop=C3=A4ische Norma=
lzeit
> > >=20
> > > schrieb Markus Feilner:
> > > > Fun fact: I installed Merkuro and found that it shows a third set
> > > > of calendar data. E.g. the appointment agreed upon via mail and
> > > > postponed on Tuesday for today does not appear at all. Seems
> > > > like the akonadi backend did not deliver neither one of the two
>=20
> > > > to merkuro-calendar at all. So I have three different sets of data:
> When You double-click on the resource in the Akonadi console and then dou=
ble
> click on the CalDAV resource URL, You should see details which calendars
> are checked for sync, just to rule out that something is "just" unchecked.
> > > > a) The Master on the caldav server that is correct and
> > > > works fine with thunderbird and davX (Android)
> > > > b) the set in Kontact-korganizer via akonadi
> > > > c) the set in MerKuro via akonadi
>=20
> I have never used Merkuro, so I can't say anything here...
>=20
> > > > I think I am getting there, slowly. What I also noticed: After
> > > > a clean login (remove the calendar from korganizer, restart
> > > > kontact, add it again) the data is correct, but as time goes
> > > > by it is getting out of sync.
> > > > In will fiddle around with what happens when I export and
> > > > import calendar data via files.
> > > > Thanks for letting me spam you here :-)
> > > >=20
> > > > Am Freitag, 27. M=C3=A4rz 2026, 08:56:03 Mitteleurop=C3=A4ische
> > > >=20
> > > > Normalzeit schrieb Markus Feilner:
> > > > > thanks for your answer, Vojt=C4=9Bch! Much appreciated.
> > > > > Running a Radicale Caldav Server. That works like a charm
> > > > > with Thunderbird and DavX - Android. Only KDE Kontact
> > > > > gets out of sync. e.g. In Kontact, I accepted an appointment
> > > > > change on Tuesday (it was scheduled for 10 am today,
> > > > > postponed to 15:00 today) that came in via mail. The chang
> > > > > e is only visible in the one KDE Kontact client that I accepted
> > > > > the change in (via mail invite).
>=20
> Acceptance of the invitation is confirmed by mail. This usually works wel=
l.
> Other issue are changes. Sometimes it happens that the server side has so=
me
> features and/or implementation which is or is not randomly available in s=
ome
> clients.... greetings to Google, MS and others -beep-.
>=20
> > > > > So this is one client that probably is out of sync, the change ne=
ver
> > > > > arrived on the server. This works fine with DavX and Thunderbird.
> > > > > What I can reproduce is: Appointments in Thunderbird or DavX are
> > > > > instantaneously written to the server, but not every KDE client d=
oes
> > > > > recieve them, even though authentication and all server data are
> > > > > correct. Sometimes akonadictl restart helps, but not always and
> > > > > not on all machines. Weird
> > > > > I would love to learn how to debug this in akonadiconsole e.g. =
=E2=80=93 I'm
> > > > > digging deeper here...
>=20
> Have a nice weekend,
> V.
>=20
> > > > > Am Freitag, 27. M=C3=A4rz 2026, 08:11:17 Mitteleurop=C3=A4ische
> > > > >=20
> > > > > Normalzeit schrieb Vojt=C4=9Bch Zeisek:
> > > > > > Dne p=C3=A1tek 27. b=C5=99ezna 2026 7:47:20, st=C5=99edoevropsk=
=C3=BD
> > > > > >=20
> > > > > > standardn=C3=AD =C4=8Das, Markus Feilner napsal(a):
> > > > > > > Hi there, is this the right place to start a thread about Cal=
dav
> > > > > > > sync problems with kontact / korganizer? I would love to learn
> > > > > > > about debugging it.
> > > > > > > I have three desktops with kontact, opensuse tumbleweed and
> > > > > > > plasma6 plus a few android devices. And somehow they always
> > > > > > > seem to be out of sync with my radicale CALDAV server.
> > > > > > > I can provide more details if wanted.. but is there a korgani=
zer
> > > > > > > mailing list or so?
> > > > > >=20
> > > > > > What is on the server side? I use it with NextCloud an
> > > > > > SOGo and I don't have any issue... Did You double
> > > > > > check that You download all resources You wish to
> > > > > > sync, You have some reasonable sync interval, etc.?


=2D-=20

Best Regards - Mit freundlichen Gr=C3=BC=C3=9Fen,

Markus Feilner, Feilner IT
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