Linux is finally getting Windows users to experiment with switching over
to Linux.  Many of those new users are natural experimenters anyway.
That is why most of the complaints on this thread include ham radio
operators that are using the serial USB connection for some other piece
of hardware.  And what do they get?  An impossible to figure out bug
with something in the OS.  That, my friends, is not how you keep growing
a user base of people sick of Windows.  As for me, this bug has broken
my spirit, and I am finally making the move away from Ubuntu and Pop OS.
This one broke me.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to brltty in Ubuntu.
https://bugs.launchpad.net/bugs/874181

Title:
  brltty daemon prevents creation of ttyUSB0 device link

Status in brltty package in Ubuntu:
  Confirmed
Status in brltty source package in Oneiric:
  Fix Released

Bug description:
  Impact:
  This bug is somewhat hardware specific, affecting all users of the USB serial 
controller, device 10c4:ea60.

  Test case:
  With the current version of brltty in Oneiric, brltty takes over any device 
using the above mentioned USB serial controller, whether it is a Braille 
display or not. This is because one of Brltty's supported displays uses this 
USB serial control internally for ocmmunication. The brltty package in 
oneiric-proposed has the udev rule for this controller commented out, allowing 
other users of devices based on this controller to work properly.

  Regression potential:
  All users of the supported Seika will have to load Brltty manually, as the 
udev rule for their device is commented out, to allow other USB serial 
controller users to use their device as a proper serial device.

  Original description follows:

  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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