April 10, 2020

Ubuntu 18.04.4 LTS – Disable tty screen and customize closed lid action

If I’m closing the lid then the system come in standby vice versa with the open lid the monitor remain always on. I choose Ubuntu 18.04.4 LTS as system OS without X Server on my old laptop, so why do I need to have the lid open? and why do I need to have the tty screen always on? Below a fast guide to configure those stuff

Change Lid Close Action

In Ubuntu 18.04 Gnome desktop, there’s no option for that, so we need to work on /etc/systemd/logind.conf and need to change the parameters on HandleLidSwitch and HandleLidSwitchDocked

This parameter manage the Lid actions and it can accept a couple of values, for my scope I what just to “ignore” the action so I just edit file in those 2 parameters with the below value:

[...]
HandleLidSwitch=ignore
HandleLidSwitchDocked=ignore
[...]

For a full and better compression of what this file does I suggest you read the man page of it with the command man logind.conf ( remeber it’s the unique and official documentation!)

Disable screen on lid close

Here I haven’t found a real scripts, so I made one from myself. The idea is to check the lid state and every time someone change this state just run a script that enable or disable the tty monitor.

In order to disable the monitor I’m using the command /usr/sbin/vbetool dpms off and viceversa in order to enable it the command /usr/sbin/vbetool dpms on

In order to read the state of Lid is possible to use the state present on /proc, so in order to see the current state of lid jut type cat /proc/acpi/button/lid/*/state and the result will be very clear!

odyno@ade:~$ cat /proc/acpi/button/lid/*/state
state: closed

Now we need to have a trigger of action open or action close of lid: the answer of this question is the events management performed by acpi on /etc/acpi/events scripts.

Well done now we have all, so as recap of all: create a new event on acpi that trigger the script that check the lid and set the screen!

In summary

Create a new script named lid_sensor on the directory /etc/acpi/events with this content:

event=button/lid.*
action=/etc/acpi/lid.sh

Create the lid.sh script on /etc/acpi, add the right permission with the command chmod +x /etc/acpi/lid.sh and fill the content of file with

That’s all!

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