Failed visuals, can't get output window example B1

Getting Started
1

Greetings!
I’m working on setting up Geant4 and made it to running examples. I seem to be able to run the macros well with no problem and get the correct outputs however I cannot get the visual from running the example. I see the output window with the visual very briefly and it disappears as soon as it loads. I’m also getting this error:
qt.qpa.xcb: QXcbConnection: XCB error: 1 (BadRequest), sequence: 165, resource id: 90, major code: 130 (Unknown), minor code: 47
qt.qpa.xcb: QXcbConnection: XCB error: 170 (Unknown), sequence: 180, resource id: 90, major code: 146 (Unknown), minor code: 20
The X11 connection broke: I/O error (code 1)
XIO: fatal IO error 2 (No such file or directory) on X server “localhost:0.0”
after 607 requests (605 known processed) with 0 events remaining.

I was having problems with getting gui earlier so I followed Linux Terminal & GUI Inside of Windows 10 (WSL) - YouTube and installed Xming which is running in the background. I can run other gui programs like xeyes and xcalc etc with no issues and they do not disappear, but I cannot get the detector visual of example B1 to stay. My system information is here:
Geant4 Version: v11.1.1
Operating System: Ubuntu for WSL
Compiler/Version: Ubuntu 2204.2.33.0

Thanks in advance for the help,
Deniz

2

Gosh, Deniz, you are ambitious!! We are seeing problems on the latest Ubuntu (see Visualisation problem in example B3)…and you also hope it will work under WSL?!! This is a configuration we have not tested—not possible to test all thousands of possibilities.

Is there any way you can get hold of a more straightforward platform for Geant4?

John

3

Unfortunately I’m confined to using WSL. I have a college who was able to make it work. I can try installing Ubuntu 22.04.2 LTS or Ubuntu 20.04.6 LTS is the issue does not appear to be a problem there. What do you recommend?
Best,
Deniz

4

I’m afraid I am not in a position to recommend a Ubuntu version—I do not use it. Sorry, hope someone else can help.

J

5

Managed to fix the issue by switching from Xming to Vcxsrv for the x server. Everything is running fine even though I still don’t understand what was wrong.

6

Ah. Good to hear you fixed it.

7

Using Ubuntu 20.04 under WSL I have experienced many failures of Windows X servers, including Xming and Vcxsrv. This is partly a matter of keeping the display driver up to date and will depend on the hardware, but sometimes even this doesn’t help.
If you have further problems I would recommend updating your WSL to 1.2.5.0 or newer (wsl --update). Then you will not require a Windows X server as the X graphics will be handled internally by Wayland. This has been working flawlessly for me.

8

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