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[Launchpad Bug Tracker <1501345@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: linux-lts-trusty (Ubuntu)
     Importance: Undecided
         Status: New

-- 
linux-image-3.13.0-65-generic 3.13.0-65 breaks Python based Serial communication
https://bugs.launchpad.net/bugs/1501345
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