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[Benjamin Zeller <1429415@xxxxxxxxxxxxxxxxxx>]

A workaround is to log into the phone with SSH/adb and restart lightdm.

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https://bugs.launchpad.net/bugs/1429415

Title:
  Unable to enter password in the lock screen after using Qtcreator to
  run apps on the device

Status in qtcreator-plugin-ubuntu package in Ubuntu:
  New
Status in unity8 package in Ubuntu:
  New

Bug description:
  I have noticed consistently that after upgrading the phone to vivid,
  while developing apps and running them on the device via Qtcreator,
  after a few runs, when the device locks (due to timeout, or manual
  locking) it is no longer possible to unlock the device by typing in
  the password in the lock screen since when I type the password, the
  passphrase characters are not typed into the textfield. It is sort of
  like the lock screen does not take any input. The only way to fix the
  solution is to reboot the phone since I cannot adb into the device
  without unlocking it first to do any unity8 reboots.

  I noticed that I get the following output line on Qtc, Connection to
  127.0.0.1 closed by remote host. I tried using 2 other cables and have
  noticed the connection closed by remote host. But despite the remote
  host closing the connection, QtC still displays the device status in
  green indicating it is detected and available. However on trying to
  run the app again, I get the error "Could not conenct to host:
  Connection refused. Is the device still connected and set up network
  access?"

  This connection is terminated by remote host after few seconds even if
  I let the app be idle during that time.

  Steps to reproduce the issue:
  1. Connect the phone to the laptop.
  2. Open any app in Qtcreator and set it to run the app on the device.
  3. Run the app on the device.
  4. Close the app on the phone and lock the device.
  5. Try unlocking the device.

  What happens:
  Device is locked and the lock screen textfield does not accept any input. Pressing on the keypad buttons doesnt do anything

  Note: The lockscreen issue happens only on vivid. But the connection
  being terminated by the remote host happens both on vivid and rtm.

  System Information:
  Laptop: Ubuntu 14.04.2 LTS
  Nexus 4(Mako) running vivid img 125
  qtcreator-plugin-ubuntu: 3.1.1+15.04.20150224-0ubuntu1~0trusty1

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