No login prompt when waking up the computer from suspend

[Hadrien]

Ubuntu 16.10 x64.

  * I let my computer go to sleep.
  * Several hours later I wake it up.

Expected result: the lock screen is displayed, waiting for me to input my password.
Actual result: I am directly back to my desktop.

I verified that the option to ask for my password at wake up is correctly checked.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: lightdm 1.19.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-22.24-generic 4.8.0
Uname: Linux 4.8.0-22-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Oct 15 18:34:14 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-10-14 (0 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Gunnar Hjalmarsson (gunnarhj)]

Thanks for your report!

I just let my computer suspend by running this command:

sudo pm-suspend

Wasn't prompted for password when wakening up the computer, which would confirm your observation.

However, I also tried:

sudo systemctl suspend

Then, when wakening up the computer, I was prompted for password as expected.

So this may be related to the upstart -> systemd transition.

[Gunnar Hjalmarsson (gunnarhj)]

Hmm.. When suspending my computer through inactivity, I'm prompted for password. Same thing when suspending through the Suspend item in the System meny. So I can't reproduce the issue after all.

One question, @Hadrien, is if your computer successfully entered into suspend mode. Can you please check what happens if you run the command:

sudo systemctl suspend

[Hadrien (psydk)]

'sudo systemctl suspend' works fine and I m prompted for my password on wake-up.

When I voluntarily ask the computer, it's ok too.

I tried to reproduce the same conditions than when the bug occurred: I was watching a flash video in my web browser, and flash does not disable screen power off nor sleep mode when a video is playing.

Unfortunately I did not reproduce the bug. If I encounter the bug again I will add more information here, hopefully I will find the conditions that led to the bug (I only saw it once but my Ubuntu 16.10 installation is fresh).

[Gunnar Hjalmarsson (gunnarhj)]

Thanks for that info. If the issue isn't reproducible it's hard to deal with..

I let the status of this bug report remain "Incomplete". It means that it will be automatically closed in a couple of months if there is no further activity. Would you be able to reproduce the issue after that, please file a new bug.

[Hadrien (psydk)]

That's fine to me, Gunnar.

[Launchpad Janitor (janitor)]

[Expired for lightdm (Ubuntu) because there has been no activity for 60 days.]