[Bug 874181] Re: brltty daemon prevents creation of ttyUSB0 device link

[Matthew Geier]

>> Let's deactivate BRLTTY default

>Please don't do that. It'd make way harder for blind people to use
Ubuntu.

 But at the moment it's causing a much larger population of people have
their USB serial devices stop working for no apparent reason. And many
devices are implemented by USB serial interfaces, some people are quite
likely to have - GPS devices for example.

 brltty should only claim the USB serial interfaces used by Braille
teletypes - although having been exposed briefly to this technology
(supporting a blind staff member), I can imagine many are just 'write
only' serial devices and thus undetectable. The modern ones probably use
the SAME usb to serial chips that other non Braille devices also use,
interfaced to the older 'write only' back end.

 As it stands, a much larger population are finding their GPS logger doesn't work, their 'ICE debugger' doesn't work, their home automation interface doesn't work, etc, etc.
 There are a truck load of USB devices out there that are implemented via a USB-serial bridge chip. 

 The only compromise I can see is to use brltty during the install
process so a blind user can install and throw up a question asking 'do
you need Braille tty support ?' and hope most sensible sighted people
will say no.

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https://bugs.launchpad.net/bugs/874181

Title:
  brltty daemon prevents creation of ttyUSB0 device link

Status in “brltty” package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from Ubuntu 11.04 to 11.10, I no longer found a
  '/dev/ttyUSB0' for my serial-to-USB converter. The device is part of a
  Xilinx FPGA board and is a "10c4:ea60 Cygnal Integrated Products, Inc.
  CP210x Composite Device".

  Every time I plugged in the device, dmesg showed the device coming up
  and 'brltty' did *something* to it. At this point, no device was
  present in '/dev'.

  [ 5181.130942] cp210x 1-1.4:1.0: cp210x converter detected
  [ 5181.203658] usb 1-1.4: reset full speed USB device number 5 using ehci_hcd
  [ 5181.296637] usb 1-1.4: cp210x converter now attached to ttyUSB0
  [ 5181.623749] usb 1-1.4: usbfs: interface 0 claimed by cp210x while 'brltty' sets config #1

  After removing 'brltty', the '/dev/ttyUSB0' device appears again like
  it used to.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: brltty (not installed)
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Fri Oct 14 14:39:29 2011
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  ProcEnviron:
   LANGUAGE=
   LC_TIME=C
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: brltty
  UpgradeStatus: Upgraded to oneiric on 2011-10-13 (0 days ago)

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