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

[Harry Bloomberg]

I think it's usb 2.  I'm not a Linux developer, so below is part of the
kernel log showing the problem.

Oct 21 19:59:29 hpb-Latitude-2120 kernel: [ 2340.040136] usb 2-1: new full speed
USB device number 12 using uhci_hcd
Oct 21 19:59:29 hpb-Latitude-2120 kernel: [ 2340.193734] hub 2-1:1.0: USB hub
found
Oct 21 19:59:29 hpb-Latitude-2120 kernel: [ 2340.195488] hub 2-1:1.0: 2 ports
detected
Oct 21 19:59:29 hpb-Latitude-2120 kernel: [ 2340.489457] usb 2-1.1: new full
speed USB device number 13 using uhci_hcd
Oct 21 19:59:30 hpb-Latitude-2120 kernel: [ 2340.826696] input: Burr-Brown from
TI               USB Audio CODEC  as
/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1:1.3/input/input18
Oct 21 19:59:30 hpb-Latitude-2120 kernel: [ 2340.827062] generic-usb
0003:08BB:2901.0009: input,hidraw2: USB HID v1.00 Device [Burr-Brown from TI
USB Audio CODEC ] on usb-0000:00:1d.0-1.1/input3
Oct 21 19:59:30 hpb-Latitude-2120 kernel: [ 2340.901453] usb 2-1.2: new full
speed USB device number 14 using uhci_hcd
Oct 21 19:59:30 hpb-Latitude-2120 kernel: [ 2341.047932] cp210x 2-1.2:1.0:
cp210x converter detected
Oct 21 19:59:30 hpb-Latitude-2120 kernel: [ 2341.121456] usb 2-1.2: reset full
speed USB device number 14 using uhci_hcd
Oct 21 19:59:30 hpb-Latitude-2120 kernel: [ 2341.246793] usb 2-1.2: cp210x
converter now attached to ttyUSB0
Oct 21 19:59:32 hpb-Latitude-2120 kernel: [ 2342.858163] usb 2-1.2: usbfs:
interface 0 claimed by cp210x while 'brltty' sets config #1
Oct 21 19:59:32 hpb-Latitude-2120 kernel: [ 2342.861068] cp210x ttyUSB0: cp210x
converter now disconnected from ttyUSB0
Oct 21 19:59:32 hpb-Latitude-2120 kernel: [ 2342.861134] cp210x 2-1.2:1.0:
device disconnected

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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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