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Linux: selecting tty device fails | auto open does work

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
64/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
python
Domain
operating-systems

Research direction

Start with configure.py and reproduce the difference between selecting ttyACM0 and auto-detection, which returns /dev/ttyACM0. Trace the selected value into serial-port opening and verify that saving a selected device preserves the correct path and allows the screen to start.

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Description

bug

Describe the bug
Selecting a specific tty device fails to open. Auto-open does work

To Reproduce
Steps to reproduce the behavior:

  1. run python3 configure.py
  2. selct the tty device
  3. save and run

Expected behavior
Open the tty device with the correct path.

Logs

(.venv)user@host turing-smart-screen-python][(HEAD 3.9.6)]$ 08.11.2025 19:48:06 [INFO] Loading theme Digital_CPU_0.96Inch from res/themes/Digital_CPU_0.96Inch/theme.yaml
08.11.2025 19:48:06 [DEBUG] Static COM port: ttyACM0
08.11.2025 19:48:06 [ERROR] Cannot open COM port ttyACM0: [Errno 2] could not open port ttyACM0
^C
(.venv)user@host turing-smart-screen-python][(HEAD  3.9.6)]$ python3 configure.py
(.venv)user@host turing-smart-screen-python][(HEAD 3.9.6)]$ 08.11.2025 19:48:26 [INFO] Loading theme Digital_CPU_0.96Inch from res/themes/Digital_CPU_0.96Inch/theme.yaml
08.11.2025 19:48:26 [DEBUG] Auto detected COM port: /dev/ttyACM0

Environment:

  • Smart screen model [e.g. Turing 5", XuanFang 3.5”]
  • Revision of this project: 3.9.6
  • OS with version: Archlinux
  • Python version [e.g. Python 3.10]
  • Hardware: x86

Additional context
The path handling is not correct. The drop down menu misses the /dev/ path in front.

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