Screen doesn't turn on

[tabarafael]

Describe the bug

When running either main.py or configure.py save and run the script gets stuck in:

05/10/2025 16:28:19 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:20 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:21 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:22 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:23 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:24 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:25 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:26 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:27 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
05/10/2025 16:28:28 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...

To Reproduce
Steps to reproduce the behavior:

1. run python3 main.py

Expected behavior
device should turn on at some point

Logs

Add logs either from the console output or the log.log file in the program main folder.

turing screen is just black with the TURZX ---- www.turxx.com logo

Environment:

• Smart screen model: Turing Smart Screen 2.1''
• Revision of this project main commit c5609b24ba034e6f2076f2a7b3db75869799ccd1
• OS with version Nobara42
• Python version Python 3.13.7
• Hardware: Sapphire 7800xt nitro+, 4700x

Additional context

I've been using turing-smart-screen with nobara 41 and was working fine, then after upgrading to 42 with a fresh install (not an actual upgrade) the turzx screen turns on and displays it's logo, but the script doesn't get it to be turned on.

Usually it would turn on after 30s or so.

[Crystalx84]

Same here.
Smart Screen Model: Turing Smart Screen 5"
OS: CachyOS
Hardware: RTX 3070Ti, 5800x

[mathoudebine]

@tabarafael @Crystalx84
It seems the issue here is that the System Monitor program fails to detect the screen is awake

• screen awake = content displayed on it (turzx logo or anything) and backlight on
• screen asleep = black screen, backlight off

The system monitor detect if the screen is awake or sleeping based on USB IDs and COM port serial number.
When the screen is plugged to the computer is is automatically awake or so I think.

To help me debug, can you run this small python program just after the screen is plugged and awake?

from serial.tools.list_ports import comports
for com_port in comports():
    if com_port.vid and com_port.pid:
        print("%s %x %x" % (com_port.serial_number, com_port.vid, com_port.pid))

[Crystalx84]

@mathoudebine
Thank you for looking into this.

I ran your python script and got those two Lines as a result:

CT21INCH 1a86 ca21
20080411 1d6b 106

The Screen is definitly awake cause i can see the Picture and Logo.

[mathoudebine]

Thank you for your answer, I see there are two devices listed:

• CT21INCH (1a86:ca21) is the screen when it is asleep
• 20080411 (1d6b:0106) is the screen when it is awake

(I assume you only have one screen plugged.)
Usually there should be only one of these two, not both at the same time. The code will be stuck in the wake up loop as long as it detects the a screen asleep is plugged.

Maybe the logic should be reversed in the code: if a screen awake is detected, then use it and ignore the screen asleep

[tabarafael]

I get:

D3DEE952BE379049 35ef 12
CT21INCH 1a86 ca21
20080411 1d6b 121

[mathoudebine]

Thank you, it is the same issue as Crystalx84. I will develop a fix and post it here to let you test it before merging

[prime6809]

Another data point here,

Suse Tumbleweekd, Belink SER5, Turing 5" screen.

Screen is awake with backlight on and www.turzx.com logo screen displayed, with the above python script I get :

20080411 1d6b 106
CT21INCH 1a86 ca21

Just to illiminate problems with the screen, it works fine on my windows machine with the official software.

Cheers.

Phill.

[mathoudebine]

@prime6809 @tabarafael @Crystalx84
Can you test the following branch to see if it fixes your issue?
fix/870-screen-doesnt-turn-on
I've reworked the wake-up mechanism to better detect when the screen is awake

[Crystalx84]

@mathoudebine
For me its working now :)

[prime6809]

@prime6809 @tabarafael @Crystalx84 Can you test the following branch to see if it fixes your issue? fix/870-screen-doesnt-turn-on I've reworked the wake-up mechanism to better detect when the screen is awake

Yep that seems to work.

Cheers.

Phill.

[tabarafael]

I think it works, the logs are still dirty

12/10/2025 15:27:46 [INFO] Loading theme 26 from res/themes/26/theme.yaml
12/10/2025 15:27:46 [DEBUG] HW revision: C
12/10/2025 15:27:46 [DEBUG] Waiting for device /dev/ttyACM1 - UsbMonitor to be turned ON...
12/10/2025 15:27:47 [DEBUG] Detected screen turned ON
12/10/2025 15:27:47 [DEBUG] Auto detected COM port: /dev/ttyACM0
12/10/2025 15:27:47 [DEBUG] Using Python 3.13.7 (main, Aug 14 2025, 00:00:00) [GCC 15.2.1 20250808 (Red Hat 15.2.1-1)]
12/10/2025 15:27:47 [INFO] Tray icon has been displayed
12/10/2025 15:27:47 [INFO] Initialize display
12/10/2025 15:27:47 [INFO] Display reset (COM port may change)...
12/10/2025 15:27:50 [ERROR] SerialException: Failed to send serial data to device. Closing and reopening COM port before retrying once.
12/10/2025 15:27:51 [DEBUG] Static COM port: /dev/ttyACM0
12/10/2025 15:27:51 [ERROR] Cannot open COM port /dev/ttyACM0: [Errno 2] could not open port /dev/ttyACM0: [Errno 2] No such file or directory: '/dev/ttyACM0'
12/10/2025 15:27:57 [DEBUG] Static COM port: /dev/ttyACM0
12/10/2025 15:27:57 [DEBUG] Display ID returned: ^Ai^@^@^@^A^@^@^@^@^
12/10/2025 15:27:57 [WARNING] Display returned invalid or unsupported ID, try again in 1 second
12/10/2025 15:27:58 [DEBUG] Display ID returned: ^@^@^@^@^@^@^@^@^@^@^@^
12/10/2025 15:27:58 [WARNING] Display returned invalid or unsupported ID, try again in 1 second
12/10/2025 15:27:59 [DEBUG] Display ID returned: chs_5inch.dev1_rom1.89
12/10/2025 15:27:59 [DEBUG] HW sub-revision detected: SubRevision.REV_2INCH, ROM version: 89
12/10/2025 15:27:59 [DEBUG] Drawing Image: BACKGROUND
12/10/2025 15:27:59 [DEBUG] Bitmap /home/tabarafael/Documents/turzx/turing-smart-screen-python/res/themes/26/background.png is now loaded in the cache
12/10/2025 15:27:59 [INFO] Waiting for all pending request to be sent to display (10s max)...
12/10/2025 15:28:00 [DEBUG] (Waited 0.5s)
12/10/2025 15:28:00 [INFO] Starting system monitoring
12/10/2025 15:28:01 [INFO] Detected AMD GPU(s)

[tabarafael]

but the screen does turn on 👍