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

[Samuel thibault]

Hazuki Amamiya, le Wed 09 Nov 2011 01:20:22 -0000, a écrit :
> I wasted over a week's time to find out why my LCD display not working
> properly before I get to here. I's say the brltty is too aggressive and
> since brltty has no intention to fix this problem (this issue repeat and
> repeat and repeat again for past few years!)

brltty is no culprit at all. There is just no way for us to know whether
braille manufacturer sanely label their USB device with a unique USB ID.
It's only when people report conflict that we can know about it, and
disable it, which is what Luke has just done. "brltty has no intention
to fix this problem" is thus just FUD.

> so I agree that brltty should be disable by default.

Simply, no.  It may have taken you a week to solve the issue, but for
blind people it's eternity that would take them to manage to use their
computer without brltty.

> I understand that the people with visual
> impairment might find it difficult to use Ubuntu by disabling brltty by
> default, but which group has more population?

Please don't just count oranges & apples.

> For the people with visual impairment they can call the
> assistance right away,

Simply, no. There's not always somebody that is able to make sense of
what is displayed on the screen.

> but how about us!? I spent a week! Yes, a week!

And blind people would spend way more time.

> And how about the GPS device company? I can imagine they are frustrated
> by this problem and probably might want to tell the customer that Ubuntu
> is not a good OS for use with GPS.

They should simply have *tested* ubuntu before its release, so that the
bug would have been spotted earlier, and fixed *before* the release.

Samuel

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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:
  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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