Thank you for reporting.

Do this fix help in your case?
https://wiki.mageia.org/en/Mageia_8_Errata#Applications_that_run_as_root_fail_to_run_in_grahics_mode

CC: (none) => fri

(In reply to Morgan Leijström from comment #1)

> Do this fix help in your case?
> https://wiki.mageia.org/en/
> Mageia_8_Errata#Applications_that_run_as_root_fail_to_run_in_grahics_mode

I've set a proper hostname, but I tried: No change.

(In reply to Christian Müller from comment #2)
> I've set a proper hostname, but I tried: No change.

Please also try
 $ xhost +si:localuser:root

(In reply to Morgan Leijström from comment #3)

> Please also try
>  $ xhost +si:localuser:root

solved, that did the trick :)

Well done Morgan. Another thing for ERRATA?

@Christian
I question the high priority given to this bug. Plasma Wayland itself is still something of an adventure.
This is not to excuse that MCC does not launch under Plasma Wayland, clearly it should. But in the meantime, the trick above works.

Can you please post the output of launching MCC (on Plasma/Wayland) from a console ? [I would if LightDM offered it...]

Severity: major => normal
Priority: High => Normal

(In reply to Lewis Smith from comment #5)

> @Christian
> I question the high priority given to this bug. Plasma Wayland itself is
> still something of an adventure.

Morgan escalated it to high priority.

I gave Wayland a try, because I experienced some serious screen flickering and glitches in X11, only with Plasma. That was gone with Wayland, but now it's gone in X11, too. I'll do a bug report on that, if it reappears.

> Can you please post the output of launching MCC (on Plasma/Wayland) from a
> console ? [I would if LightDM offered it...]

Here you are:

$ drakconf
Too late to run INIT block at /usr/lib64/perl5/vendor_perl/Glib/Object/Introspection.pm line 257.
Ignore the following Glib::Object::Introspection & Gtk3 warnings
Subroutine Gtk3::main redefined at /usr/share/perl5/vendor_perl/Gtk3.pm line 539.
GLib-GObject-CRITICAL **: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed at /usr/lib64/perl5/DynaLoader.pm line 210.
GLib-GObject-CRITICAL **: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed at /usr/lib64/perl5/DynaLoader.pm line 210.
GLib-GObject-CRITICAL **: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed at /usr/lib64/perl5/DynaLoader.pm line 210.
GLib-GObject-CRITICAL **: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed at /usr/lib64/perl5/DynaLoader.pm line 210.
"cannot run /usr/sbin/isodumper" since it is not installed [Writing ISO] at /usr/libexec/drakconf line 833.
"cannot run /usr/sbin/drakguard" since it is not installed [Parental Controls] at /usr/libexec/drakconf line 833.
Oops, secure memory pool already initialized
Oops, secure memory pool already initialized

Great
Yeah escalated it to get some movement on this before final.
Happy the fix works so far, but need be re-issued next boot.
Added to Wayland paragraph at https://wiki.mageia.org/en/Mageia_8_Errata#Plasma

Keywords: (none) => IN_ERRATA8
See Also: (none) => https://bugs.mageia.org/show_bug.cgi?id=26101

We stopped supporting Mageia 8 almost 8 months ago 
https://blog.mageia.org/en/2023/12/30/mageia-8-end-of-life/

That means we also stopped fixing Mageia 8 bugs and that this bug report needs to be closed, regardless of whether it was fixed for Mageia 8 or not.

If this particular bug did not get fixed for Mageia 8, then we do regret that.

If this issue is still present in Mageia 9 or cauldron, then please reopen this report, write a comment and adjust the "Version:" field.

If you are not yet a member of one or our teams, then please consider becoming one. https://wiki.mageia.org/en/Contributing
Mageia is a community project, meaning that we, the users, make Mageia together.

The more active contributors we have, the more bug reports will get fixed.
Besides, being active in a team can be very rewarding. It was and is certainly rewarding to me :-D

Resolution: (none) => OLD
Status: NEW => RESOLVED