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). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-lts-trusty in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-trusty/+bug/1501345/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
