[Bug 1970408] Re: brltty package disconnecting ttyUSB0 used for Arduino

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: brltty (Ubuntu)
       Status: New => Confirmed

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Title:
  brltty package disconnecting ttyUSB0 used for Arduino

Status in brltty package in Ubuntu:
  Confirmed

Bug description:
  Hello

  I connected an ESP8266 microcontroller to my pc to use with Arduino.
  However, the interface didn't appears to list ttyUSB0. Upon inspection
  with dmesg, I noticed that the device is recognised but then brltty
  appears to disconnect it.

  [Tue Apr 26 19:09:35 2022] usb 1-8: New USB device found, idVendor=10c4, idProduct=ea60, bcdDevice= 1.00
  [Tue Apr 26 19:09:35 2022] usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [Tue Apr 26 19:09:35 2022] usb 1-8: Product: CP2102 USB to UART Bridge Controller
  [Tue Apr 26 19:09:35 2022] usb 1-8: Manufacturer: Silicon Labs
  [Tue Apr 26 19:09:35 2022] usb 1-8: SerialNumber: 0001
  [Tue Apr 26 19:09:35 2022] cp210x 1-8:1.0: cp210x converter detected
  [Tue Apr 26 19:09:35 2022] usb 1-8: cp210x converter now attached to ttyUSB0
  [Tue Apr 26 19:09:38 2022] usb 1-8: usbfs: interface 0 claimed by cp210x while 'brltty' sets config #1
  [Tue Apr 26 19:09:38 2022] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
  [Tue Apr 26 19:09:38 2022] cp210x 1-8:1.0: device disconnected

  This also appears to have happended to other people:
  https://stackoverflow.com/questions/52143723/usb-serial-loses-
  connection-immediately-in-new-linux-kernel-4-12-14

  Once the brltty package is removed, the USB device mounts fine and
  Arduino find it (same dmesg as above, without the last 3 lines).

  I'm actually not sure why this package is installed as I deleted it
  without having to remove ubuntu-desktop.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: brltty (not installed)
  ProcVersionSignature: Ubuntu 5.15.0-27.28-generic 5.15.30
  Uname: Linux 5.15.0-27-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Apr 26 19:15:04 2022
  InstallationDate: Installed on 2022-04-06 (20 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  SourcePackage: brltty
  UpgradeStatus: Upgraded to jammy on 2022-04-18 (8 days ago)

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