Arch Linux

ldelossa

Member

Registered: 2015-01-03

Posts: 2

Light-DM Lock on Hibernate

Hey guys,

I'm trying to get my new Linux Arch build on a x1 carbon (2nd gen) to lock the screen just before it attempts to hibernate. I tried this many difference ways. One being acpid - which I find to be very flackey. I have since removed the ACPID package and I'm hibernating using logind hook in /etc/systemd/logind.conf

I've attempted to go even as far as adding another execstart statement into the systemd-hibernate.service file in /usr/lib/systemd/system directory. This ran the dm-tool lock command, however it ran it as what I'm assuming is the root session, which then the tool complains that there is no display manager. I don't see a way to tell dm-tool to run the lock command in a different tty or session.

I was also thinking about a way to run a script in systemd-hibernate.service that will then run dm-tool lock in my user session, or any available user session if the script can enumerate this.

My instinct is that editing the systemd-hibernate.service file is not the best way to go here, as it's a systemd specific file and just feels wrong lol.

Any suggestions?

Last edited by ldelossa (2015-01-03 17:43:59)

progandy

Member

Registered: 2012-05-17

Posts: 5,280

Re: Light-DM Lock on Hibernate

I believe Light DM works well with the logind session API, so I guess you should use a user session lock manager that listens for the systemd lock, unlock and hibernate events like xss-lock. Desktop environments like gnome, kde and mate should come with its own screensaver/locker mechanism.
With xss-lock you can then run a screenlocker like xlock to make the session inaccessible and use dm-tool to switch to the greeter. When you unlock your session in the greeter, xss-lock should receive a systemd unlock event and kill the locker.
Edit: I can't test it since I use slim now, I didn't need all that fancy stuff from lightdm.

Last edited by progandy (2015-01-03 17:56:09)

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ldelossa

Member

Registered: 2015-01-03

Posts: 2

Re: Light-DM Lock on Hibernate

Very interesting, I do like light-dm however I'm not completely opposed to switching to another DM, if it means there's less CPU/actual time taken to hibernate and lock the machine.

So if I understand you correctly, you are saying use xss-lock to notify light-dm that a acpi event has taken place (lid shut). xss-lock will lock my user session, and then send a notification to light-dm to lock the desktop? Unlocking my session via light-dm will then send a notification to xss-lock and that will unlock the user session?

Do I have a correct understanding?

Last edited by ldelossa (2015-01-03 18:18:28)

pszafer

Member

Registered: 2015-01-22

Posts: 39

Re: Light-DM Lock on Hibernate

Hello,
I think that I can help you with that:
- create lockscreen.sh file somewhere in your home directory with:

#!/bin/sh
XDG_SEAT_PATH="/org/freedesktop/DisplayManager/Seat0" dm-tool lock

- I've prefer just for sure creating dmlock.service file in home dir and create symlink to /etc/systemd/system.
File has to be in /etc/systemd/system/dmlock.service

[Unit]
Description=DM Lock before sleep
Before=sleep.target

[Service]
ExecStart=/home/user/dir/lockscreen.sh

[Install]
WantedBy=sleep.target

For your needs, you probably need hibernate.target.

Next run following commands:

systemctl daemon-reload
systemctl enable dmlock.service

Just for sure it is working you could run:

systemctl list-unit-files
systemctl start dmlock.service

Hope it helps you a little

Alad

Wiki Admin/IRC Op

From: Bagelstan

Registered: 2014-05-04

Posts: 2,420

Website

Re: Light-DM Lock on Hibernate

I've never got it working myself, but you could try lightlocker which was specifically written for lightdm.

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