5 minutes inactivity on a lock screen causes 2nd locking

[Mikhail V. Golubev]

If you don't type password on the lock screen and leave it inactive for 5 minutes system decides that it's reason to lock screen again. And system locks screen again automatically when you unlock it.

Ubuntu 14.04
unity-greeter 14.04.6-ubuntu1

Steps to reproduce this bug:
1. Leave system inactive for 5 minutes (or more).
2. After 5 minutes of inactivity (5 minutes is default timeout for screen locking) screen fades to black (turns off) and system locks.
3. After screen locking just move mouse or press any key.
4. Lock screen (unity-greeter) appears with password prompt.
5. Don't type password and again leave system inactive for 5 minutes (or more).
6. After 5 minutes of inactivity on lock screen screen doesn't turn off.
7. Enter your password on the lock screen and unlock system.
8. System unlocks but in 5-10 seconds it locks again (because of 5 minutes inactivity on lock screen).
9. Enter your password on the lock screen again and unlock system 2nd time.
10. Now you can continue to work with system.

Expected:
On step 6:
6. After 5 minutes of inactivity on lock screen screen turns off again (without locking, because it already locked).
On step 8:
8. System unlocks fine without automatic 2nd screen locking in 5-10 seconds.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Justin Nichols (jnichols21)]

I'm able to get the double lock screen issue simply by forcing a lock using CTRL+ALT+L (and in my case it runs a script that does the following):

#!/bin/bash
sleep 0.5
xset dpms force off
gnome-screensaver-command -l

Then when I come back to the computer (potentially after the normal idle time, I'm not certain) and unlock with my password, the desktop appears and 5-10 seconds later, the computer locks again automatically. Simply, if the computer isn't idle, it shouldn't lock (and unlocking should be enough to make it no longer idle).

[John Theodore (jtheodore)]

+1, this bug exists. I have to 'unlock' twice.

[Andrew Nenakhov (andrew-nenakhov-redsolution)]

This bug affects me too. I also noticed that lockscreen reappeared once I had text input focused on chat application, and while I was trying to enter password it entered it into chat app and sent my password to other party (while all I could see was just a lockscreen!) This bug is severe for security reasons.

[John Theodore (jtheodore)]

This bug is super annoying and the release date is approaching