<![CDATA["Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu)]]>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.
  1. 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

  1. Disabled ModemManager (Ubuntu)
sudo systemctl stop ModemManager
  1. Flashed the latest UIFlow2 firmware using M5Burner
  • Used M5Burner to install the latest version of UIFlow2.
  • Issue persists even after flashing and rebooting.
  1. 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. 😊

]]>https://community.m5stack.com/topic/7365/disconnected-from-serial-port-while-running-hello-world-on-m5stack-uiflow2-ubuntuRSS for NodeWed, 29 Apr 2026 03:37:43 GMTWed, 05 Mar 2025 16:38:29 GMT60<![CDATA[Reply to "Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu) on Tue, 20 May 2025 01:24:30 GMT]]>@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

]]>https://community.m5stack.com/post/29069https://community.m5stack.com/post/29069Tue, 20 May 2025 01:24:30 GMT<![CDATA[Reply to "Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu) on Mon, 19 May 2025 07:29:32 GMT]]>@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.

]]>https://community.m5stack.com/post/29065https://community.m5stack.com/post/29065Mon, 19 May 2025 07:29:32 GMT<![CDATA[Reply to "Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu) on Wed, 30 Apr 2025 01:25:25 GMT]]>@Zverik
have you flashed the correct firmware?

]]>https://community.m5stack.com/post/28992https://community.m5stack.com/post/28992Wed, 30 Apr 2025 01:25:25 GMT<![CDATA[Reply to "Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu) on Tue, 29 Apr 2025 14:33:13 GMT]]>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
]]>https://community.m5stack.com/post/28988https://community.m5stack.com/post/28988Tue, 29 Apr 2025 14:33:13 GMT<![CDATA[Reply to "Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu) on Mon, 21 Apr 2025 23:01:41 GMT]]>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?

]]>https://community.m5stack.com/post/28942https://community.m5stack.com/post/28942Mon, 21 Apr 2025 23:01:41 GMT