This bug is back in kernel 4.8 series. I'm seeing it in pyserial, using
the Cura 2.4 application, on current Ubuntu 16.04 LTS install.
** Also affects: linux-lts-xenial (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1501345
Title:
linux-image-3.13.0-65-generic breaks serial communication
Status in linux-lts-trusty package in Ubuntu:
Fix Released
Status in linux-lts-xenial package in Ubuntu:
New
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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