"Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu)

[AlphaBrabo]

Issue Summary

I'm trying to run a simple "Hello World" program on my M5Stack Core using UIFlow2 on Ubuntu 22.04, but I keep experiencing an issue where the serial connection drops unexpectedly. Here’s what happens when clicking Run or Download the program to the device: a pop up appears, the device connects successfully and logs RAM information:

heap RAM free: 55760
heap RAM alloc: 45296
heap RAM free: 55760
heap RAM alloc: 45296
...

After a few seconds, I get "Disconnected from Serial Port", and the device is no longer accessible.

My device shows Public, the device mac, the associated user account, a QR Code ...

What I've Tried So Far

1. Checked USB connection

• Used a high-quality data USB cable.
• Switched between USB 2.0 and USB 3.0 ports.
• Tried a different cable and another PC.

2. Verified Serial Port availability

After disconnection, I ran ls /dev/ttyACM*

Before and After disconnection: /dev/ttyACM0 is listed. I can't see if it disconnects when I upload the code

3. Disabled ModemManager (Ubuntu)

sudo systemctl stop ModemManager

4. Flashed the latest UIFlow2 firmware using M5Burner

• Used M5Burner to install the latest version of UIFlow2.
• Issue persists even after flashing and rebooting.

5. Tried a minimal script in UIFlow2

from m5stack import *
from m5ui import *
from uiflow import *

lcd.clear()
lcd.print("Hello World", 10, 10)

The screen does not display "Hello World" before disconnection occurs.

Questions

• Why does my M5Stack disconnect from the serial port after a few seconds?
• Is this a firmware issue or a hardware problem?
• Could this be related to power management settings or a driver issue on Linux?

Any help would be greatly appreciated! Thanks in advance. 😊

[schnauzer]

Hi.

I have the same problem. My Mint Linux pops up the terminal; says it connected; says it disconnected.

Have you made any progress solving this problem?

[Zverik]

Yup, same. Got my M5Stack Basic 2.7 today, burned UIFlow2, but when I try to open a console, or run a program, it shows some log about connecting and disconnecting, and does nothing:

Connected to Serial Port!
4592
heap RAM free: 86704
heap RAM alloc: 2heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM 4592
heap RAM free: 86704
heap RAM alloc: 24592

Disconnected from Serial Port

[kuriko]

@Zverik
have you flashed the correct firmware?

[Zverik]

@kuriko Of course, I've used M5Burner with the latest UIFlow2, as per the documentation. Just tried with the updated 2.2.7 version, still nothing.

[kuriko]

@Zverik
that's a bit of weird, i think you should try flash the factory firmware to test out if that was a hardware failure