kernel-packages team mailing list archive

[psylem <1501345@xxxxxxxxxxxxxxxxxx>]

I can confirm that 3.13.0-63 kernel works.

If you rely on this functionality, editing GRUB_DEFAULT to something
like "Advanced options for Ubuntu>Ubuntu, with Linux 3.13.0-63-generic"
is a graceful way to downgrade kernel in the interim. You can list
available kernels with "cat /boot/grub/grub.cfg | grep menuentry". Just
run update-grub to apply, then reboot. I'd then recommend subscribing to
this bug for updates so you don't forget to revert grub settings once
it's fixed.

I didn't have 3.13.0-63 available on my system until I manually
installed the packages (linux-headers-3.13.0-63 linux-
headers-3.13.0-63-generic linux-image-3.13.0-63-generic linux-image-
extra-3.13.0-63-generic linux-signed-image-3.13.0-63-generic).

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https://bugs.launchpad.net/bugs/1501345

Title:
  linux-image-3.13.0-65-generic 3.13.0-65 breaks Python based Serial
  communication

Status in linux-lts-trusty package in Ubuntu:
  Confirmed

Bug description:
  Today after updating to the linux-image-3.13.0-65-generic 3.13.0-65
  Kernel on Lubuntu 14.04.3 LTS two different programs that rely on
  PySerial quit working. miniterm.py and my ROS (Robot Operating System)
  based Python node quit working.

  When rebooted and selected 3.13.0-63-generic via GRUB everything
  worked again.

  Here are the steps to create the issue with miniterm.py, note that you
  need something connected via a USB to Serial adapter for this to work.
  I am working with a Parallax Activity Board, but an Arduino should
  also exhibit the same behavior.

  sudo apt install linux-image-3.13.0-65-generic
  sudo apt install linux-image-extra-3.13.0-65-generic
  reboot

   $ miniterm.py /dev/ttyUSB0 115200
  --- Miniterm on /dev/ttyUSB0: 115200,8,N,1 ---
  --- Quit: Ctrl+]  |  Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---

  --- exit ---
  Exception in thread Thread-1:
  Traceback (most recent call last):
    File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
      self.run()
    File "/usr/lib/python2.7/threading.py", line 763, in run
      self.__target(*self.__args, **self.__kwargs)
    File "/usr/bin/miniterm.py", line 220, in reader
      data = character(self.serial.read(1))
    File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 460, in read
      raise SerialException('device reports readiness to read but returned no data (device disconnected?)')
  SerialException: device reports readiness to read but returned no data (device disconnected?)

  Reverting to the 3.13.0-63 kernel allows miniterm.py and other Python
  Serial based programs to work normally.

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