[Bug 1990357] Re: ch340 USB/serial - brltty interference

[Bill Turner, wb4alm]

Under UBUNTU 22.04.1 brltty PREVENTED me from using a USB->serial
converter to access a remote piece of equipment. Once uninstalled, I had
full access to the remote device.

Under LINUX MINT 21, you cannot uninstall brltty, and it did --NOT--
create a problem with the remote device, other than a name change to the
port.

Under UBUNTU 22.04.1, the port is named  /dev/ttyUSB0
Under Linux Mint 21,  the port is named  /dev/ttyS0

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to brltty in Ubuntu.
https://bugs.launchpad.net/bugs/1990357

Title:
  ch340 USB/serial - brltty interference

Status in brltty package in Ubuntu:
  Confirmed

Bug description:
  the CH340 does show up in lsusb:
  'Bus 001 Device 005: ID 1a86:7523 QinHeng Electronics CH340 serial converter'

  but does not show up in /dev if brltty is installed on the system.

  Device does show up as /dev/ttyUSB0 after removing brltty and
  rebooting.

  tested systems:
  Ubuntu 22.04.1 (live USB) - problem present
  Linux Mint 21 (fresh install, updated) - problem present

  ubuntu-bug does not recognise brltty as an ubuntu package and thus
  refuses to collect data.

  The CH340 is a very common USB/serial converter chip used in cheap 3D printers and microcontroller development boards.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5json: {
  CurrentDesktop: X-Cinnamon
  DistroRelease: Linux Mint 21
  InstallationDate: Installed on 2022-09-20 (0 days ago)
  InstallationMedia: Linux Mint 21 "Vanessa" - Release amd64 20220726
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  Package: brltty 6.4-4ubuntu3 [origin: Ubuntu]
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 5.15.0-48.54-generic 5.15.53
  Tags: third-party-packages vanessa
  Uname: Linux 5.15.0-48-generic x86_64
  UnreportableReason: This does not seem to be an official Linux package. Please retry after updating the indexes of available packages, if that does not work then remove related third party packages and try again.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip input lpadmin plugdev sambashare sudo
  _MarkForUpload: True

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/brltty/+bug/1990357/+subscriptions