Visualization affected by QObject::connect missing signals

Recording, Visualizing and Persisting Data
1

Dear G4 experts,

I get the following message when using sequential mode.

Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome.
Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.

QObject::connect: No such signal QTabWidget::tabCloseRequested(G4int)
QObject::connect: No such signal QTabWidget::currentChanged(G4int)
QObject::connect: No such signal QTabWidget::currentChanged(G4int)
QObject::connect: No such signal QComboBox::activated(G4int)

I can see my visualization, but at some point everything jam and my computer’ screen freezes. I then must force shutting down the computer to get back to work…

Any possible solutions?

Thank you in advance,
Younes

Some useful infos:
geant4-11-01-patch-01
Using Qt version 5.15.3
Ubuntu 22.04.2 LTS

2

Hi!
I succeeded to solve the warning part related to the use of Wayland.

I added the line :
WaylandEnable=false to /etc/gdm3/custom.conf
After restarting; X11 is taking control.

However, the QObjects part still perciste.
Therefore, I can’t acces to UI through my visualization.

Thank you for your suggestions!
Younes

3

Hi Younes

It’s good now you have some success with X11. But strange you no longer get the Qt GUI. What cmake options did you specify?

I’m afraid I have no experience of Ubuntu, with or without Wayland. There have been issues with Wayland before–have you searched the Forum?

John

4

Hi John,

I’m specifying the following cmake options:>

-DGEANT4_BUILD_MULTITHREADED=ON
-DGEANT4_INSTALL_DATA=ON
-DGEANT4_USE_QT=ON
-DGEANT4_USE_OPENGL_X11=ON

Yes, I’ve searched the Forum but unfortunately nothing worked for me.

Best regards,
Younes

PS: I believe that geant4 is not yet compatible with Ubuntu 22, I’m willing to downgrade to Ubuntu 20.04.

5

Your cmake options look OK.

6

update:

I’ve formatted my computer. I can now play with my visualization without any problem.

However, the QObject message still pop up.

QObject::connect: No such signal QTabWidget::tabCloseRequested(G4int)
QObject::connect: No such signal QTabWidget::currentChanged(G4int)
QObject::connect: No such signal QTabWidget::currentChanged(G4int)
QObject::connect: No such signal QComboBox::activated(G4int)

Any ideas about the origin of these lines please share them.

Best regards,
Younes

7

Hi Younes

I think this issue is fixed in the next release. It’s annoying but I think it does not seriously affect behaviour.

John

8

P.S. Great you’re running OK again. What exactly does it mean, “formatted my computer”?

9

Hello John,
Yes, I can confirm this.

Still, the user interface was affected for my Ubuntu 22. After several builds; I think the issue is related to software version compatibility.

By formatting my computer, I meant erasing all data and doing a clean install. I’m now using Ubuntu 20 as my Linux operating system.

Best regards,
Younes