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

[ironfisher]

Samuel thibault (samuel-thibault) wrote:
>That is already what I proposed: comment the entry in the udev rule
>file, just like is already done for some of the handytech devices.

This error has been going on for years.

Any solution is fine if this error does not happen again. I do not want more people to waste their time solving this problem.
Let us make Ubuntu easier to use. It has no sense the need to uninstall a software for blind people in order to use the USB as an UART. It sounds completely stupid.

This issue should be solved for next release. So, you can use either
"brltty" or your default software to comunicate with your device through
/dev/ttyUSB

Thanks.

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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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