screen lock has triggered but keyboard is still connected to the main session

[Andy Whitcroft]

I have a laptop which has screensaved "naturally" due to timeout (most likely) and it is sitting there showing the lock screen but keyboard is still connected to the session, I can alt-tab to applications and via IRC i was able to send myself messages (blind) so clearly the keyboard is really operational.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.9.11-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar 13 20:56:10 2014
EcryptfsInUse: Yes
SourcePackage: lightdm
UpgradeStatus: Upgraded to trusty on 2014-01-17 (55 days ago)

[Sebastien Bacher (seb128)]

the screen locking is done by unity, not lightdm. How do you notice that the keybinding are active, is there any visible effect? Does it happen every time?

[Andy Whitcroft (apw)]

I am unsure if it is reproducible as yet. I noticed when the *'s did not appear on unlock attempt. I then noticed ALT-Tab was working, when it should not be. Then I sleected my IRC client and blind selected a private channel and sent myself a message, which I received on another machine.

[Launchpad Janitor (janitor)]

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

[Nelson Elhage (nelhage)]

This also just affected me.

Possibly-relevant detail from my environment: If I explicitly lock the screen and then also wait for a lock timeout, I somehow end up with two lock screens -- I unlock the machine, I can interact with the desktop for a few seconds, and then a second lock screen pops up. When I hit this bug, I'd unlocked the first lock screen but not the second.

[Seth Arnold (seth-arnold)]

Nelson, thanks; I believe the double-lock bug is tracked here: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1292451

[Sebastien Bacher (seb128)]

The issue initially reported has been fixed in that update
https://launchpad.net/ubuntu/+source/unity/7.1.2+14.04.20140313-0ubuntu1

@Nelson: can you describe exactly what you did and what happened? the "lock again" issue is another bug as pointed in the previous comment

[Nelson Elhage (nelhage)]

@seb128: I came back to my laptop after having locked it manually, and having had the lock timeout elapse.

I unlocked the screen, and started using the laptop. 5-10s later the screen locked, per #1292451. I typed my password again and hit Enter, and nothing happened. Trying again, I noticed that the password entry box was not filling up with *'s in response to my typing. I eventually noticed that I could send other keystrokes and get the window-chooser or workspace-chooser popups, suggesting that my keystrokes were going to the desktop underneath. I logged in on a tty and killed the lock screen, and discovered that my initial password+return had gone to the google talk window below, chatting my login password to a friend.

[Seth Arnold (seth-arnold)]

This may be related to https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1306431

[Margarita Manterola (marga-9)]

This happened to me once on a two monitor desktop.

I also have the two lock bug, and it happened after I had already unlocked the first lock. i.e. I entered my password, had a brief glance of my desktop and then got the lock again (normal), but the lock didn't show the dots when I tried to type my password.

Today I had a related instance of the prompt on the left not taking the input but the prompt on the right taking it.

[Janne Savikko (jsavikko)]

This happened to me too a couple of times. The first lockscreen accepted my password, let me in for a second and then the lockscreen was presented again and from that prompt my password leaked to application with focus behind the locker. I removed light-locker package and didn't see the problem anymore... Until after a day or two bug appeared again and this time my password leaked to IRC.

It seems that Tahr wasn't so trusty. I changed to a different window environment a month ago and "surprisingly" haven't seen the problem since then. I'm wondering if this problem is still present, haven't been brave enough to test Unity since then...

[Andrea Azzarone (azzar1)]

Please confirm that the problem is still happening. Should be fixed.

[Dave Jones (avesummathat)]

Yes, has just happened to me - fully updated 14.04 this morning.

In my case it was an active Citrix remote session that was left capturing the keyboard when the screen locked itself- the lock screen could be clicked with the mouse, but the keyboard was typing into my Citrix session (so my password was passed into Citrix).

[Mateusz Stachowski (stachowski-mateusz)]

@Dave Jones the problem that you describe is almost certainly already reported as:

https://bugs.launchpad.net/unity/+bug/1305586 (Lock screen is unusable when some windows have a keyboard/mouse grab)

I also think that this bug is a duplicate of Bug #1305586.