Print statements in a KWin script not outputting to journal

Help
,
1

I’ve tried to follow the steps here so that print statements in a KWin script generate output to the journal:

  1. In kdebugsettings, set the level for KWin Scripting to Full Debug
  2. I also noticed a custom rule *.debug=false, so I deleted that
  3. Added an script in /etc/environment.d/ to set QT_LOGGING_RULES="kwin_*.debug=true"
  4. Restarted, and verified that echo $QT_LOGGING_RULES shows kwin_*.debug=true

However, I still don’t get print output in the journal.

As a minimal test, I execute this script from the KWin interactive console:

workspace.windowActivated.connect(function(client){
    print('signal fired');
});

I expect to see a journal entry saying “signal fired” each time a window is activated, but nothing appears.

Now, I’m pretty sure that this way of registering handlers does work, because when I execute this from the KWin interactive console:

workspace.windowActivated.connect(function(client){
    print(client.caption);
});

then I get errors in the journal like:

Oct 23 13:40:52 kwin_wayland[2157]: file:///home/me/.local/share/plasma-interactiveconsole/interactiveconsoleautosave.js:2: TypeError: Cannot read property 'caption' of null

which wouldn’t appear if the listener function did not run.

So as far as I can tell, I have successfully attached a listener to the windowActivated signal, but when the listener tries to print something, it doesn’t make it to the journal.

What could I do to troubleshoot further?

My kinfo:

Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.17.4-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5700X 8-Core Processor
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 3060 Ti
2

Found a solution - console.info in place of print works.

(Found from this helpful bug comment by @hexchain.)

Perhaps this is worth mentioning in the documentation?