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

[David Spoelstra]

BTW, this is a big deal. I've already had over a dozen microcontroller
students with this problem that upgraded to Ubuntu 22.04 LTS and could
no longer program their Arduinos.

It also affects any amateur radio operators using FTDI USB to Serial
adapters and I've had several of them call me when their adapters no
longer worked after upgrading to Ubuntu 22.04 LTS.

I filed a bug on brltty and the FTDI chips:
Bug #1972030

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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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