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Displaycal and python 3.14 / Applications & Desktop Environments
glenjo · 2026-06-21 · via Arch Linux Forums

BTW I'm running this on a different box and updated displaycal

vicb@amelia [ ~ ]$ pacman -Q | grep displaycal
displaycal 3.9.17-3

It gets this far and stops.
This is the terminal dump and the informational window that is displayed shows the portion in the 'box' below.

.
.
Generating A2B1 table lookup input values...
cLUT grid res: 33
Looking up input values through A2B1 table (12 workers)...
Using CAM Jab for clipping
Acquired lock file: <DisplayCAL.main.AppLock object at 0x7f3366c1ba10>
displaycal 3.9.17 2025-09-11T10:20:26Z
arch rolling n/a x86_64
Python 3.14.2 (main, Jan  2 2026, 14:27:39) [GCC 15.2.1 20251112]
Faulthandler 
wxPython 4.2.3 gtk3 (phoenix) wxWidgets 3.2.9
Encoding: utf-8
File system encoding: utf-8
Loading /home/vicb/.config/dispcalGUI/dispcalGUI.ini
Loading /home/vicb/.config/dispcalGUI/dispcalGUI-testchart-editor.ini
Existing client using port 40365
Connecting to 40365...
Connected to 40365
Getting instance name
AppSocket.send start
data_to_send: b'getappname\n'
Sent scripting request, awaiting response...
Scripting client 127.0.0.1:43366 connected
Received scripting request from 127.0.0.1:43366: getappname
AppSocket.read() end
Got response: 'displaycal'
Notifying existing instance
AppSocket.send start
data_to_send: b'DisplayCAL\n'
Sent scripting request, awaiting response...
Received scripting request from 127.0.0.1:43366: DisplayCAL
NoneType: None
┌──────────────────────────────────────────────────────────────────────────────┐
│ Traceback (most recent call last):                                           │
│   File "/usr/lib/python3.14/site-packages/wx/core.py", line 3425, in         │
│ <lambda>                                                                     │
│     lambda event: event.callable(*event.args, **event.kw) )                  │
│                   ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^                    │
│   File "/usr/lib/python3.14/site-packages/DisplayCAL/wxwindows.py", line     │
│ 1383, in finish_processing                                                   │
│     state = self.get_app_state("plain")                                      │
│   File "/usr/lib/python3.14/site-packages/DisplayCAL/wxwindows.py", line     │
│ 1218, in get_app_state                                                       │
│     response = format_ui_element(win, format)                                │
│   File "/usr/lib/python3.14/site-packages/DisplayCAL/wxwindows.py", line     │
│ 8015, in format_ui_element                                                   │
│     (child.Label and " " + demjson.encode(child.Label)),                     │
│                            ~~~~~~~~~~~~~~^^^^^^^^^^^^^                       │
│   File "/usr/lib/python3.14/site-packages/DisplayCAL/demjson_compat.py",     │
│ line 153, in encode                                                          │
│     return json.dumps(                                                       │
│            ~~~~~~~~~~^                                                       │
│         obj,                                                                 │
│         ^^^^                                                                 │
│     ...<3 lines>...                                                          │
│         encoding=encoding or "utf-8",                                        │
│         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                        │
│     )                                                                        │
│     ^                                                                        │
│   File "/usr/lib/python3.14/json/__init__.py", line 238, in dumps            │
│     return cls(                                                              │
│            ~~~^                                                              │
│         skipkeys=skipkeys, ensure_ascii=ensure_ascii,                        │
│         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                        │
│         check_circular=check_circular, allow_nan=allow_nan, indent=indent,   │
│         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   │
│         separators=separators, default=default, sort_keys=sort_keys,         │
│         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         │
│         **kw).encode(obj)                                                    │
│         ^^^^^                                                                │
│ TypeError: JSONEncoder.__init__() got an unexpected keyword argument         │
│ 'encoding'                                                                   │
└──────────────────────────────────────────────────────────────────────────────┘

I press the 'ok' button on the window that shows the error message
and then it hangs indefinitely on 'Create profile from measurement data...' window.
All that window shows is
an ever increasing 'Elapsed time'
and 'Remaining time' as '--:--:--'