Cfxtrjtrk

I've been at trying to do this for the last several hours with no progress.

I'm running Ubuntu 16.04 and I want to disable the sleep/suspend at the login screen (before logging in with any user) so that the display stays active. The suspension/sleep starts after 5 minutes -- a setting I can't seem to find anywhere.

Things that I've tried:

GUI

Done for both (all) users:

• Never suspend under Power


• Never turn screen off under Brightness and Lock.

Terminal

gsettings set org.gnome.desktop.session idle-delay 0

sudo /bin/systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

xset s noblank

xset s off

xset dpms force off

xset -dpms

crontab -e:

added

@reboot sudo /bin/systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

@reboot /usr/bin/xset s noblank

@reboot /usr/bin/xset s off

@reboot /usr/bin/xset dpms force off

@reboot /usr/bin/xset -dpms

dconf org.gnome.settings-daemon.plugins.power

critical-battery-action nothing

idle-dim false

lid-close-ac-action nothing

lid-close-battery-action nothing

sleep-inactive-ac-timeout 0

sleep-inactive-ac-type nothing

sleep-inactive-battery-timeout 0

sleep-inactive-battery-type nothing

time-critical 36000

time-low 36000

(The computer has neither lid nor battery btw)

sudo gedit /etc/X11/xorg.conf

Added

Section "ServerFlags"

  Option "BlankTime" "0"

  Option "StandbyTime" "0"

  Option "SuspendTime" "0"

  Option "OffTime" "0"

EndSection

Caffeine

Added

@reboot /usr/bin/caffeine &

in crontab. Also thought about doing the same with

@reboot /usr/bin/caffeine -t 36000

but

caffeine -t 36000

returns

usage: caffeinate [-h] [-V] COMMAND [ARGUMENT [ARGUMENT ...]]

caffeinate: error: unrecognized arguments: -t

acpi

Don't have it.

Any help would be much appreciated!

I found a solution from here https://askubuntu.com/a/543861/718511, though they wanted to do the reverse so it's slightly modified. Essentially a script is made to disable dpms and lightdm told to run it.

In /etc/lightdm/lightdm.conf.d/ make a file 50-dpms.conf:

sudo nano /etc/lightdm/lightdm.conf.d/50-dpms.conf

Add the lines

[SeatDefaults]

display-setup-script=/usr/local/bin/dpms-stop

Close the file

In /usr/local/bin/ create a file dpms-stop:

sudo nano /usr/local/bin/dpms-stop

Add the lines

#!/bin/sh

sudo xhost +si:localuser:lightdm # grants localuser rights to X session

sudo su lightdm -s /bin/bash <<HERE

/usr/bin/xset -dpms

exit

HERE

Close the file

Make the file executable:

sudo chmod +x /usr/local/bin/dpms-stop

At reboot it worked for me.

I had the same issue and found the solution in this forum thread. Setting the appropriate value using gsettings worked for me. Note that this needs to be set for the lightdm user, not for your own account or for root. Maybe this was your problem?

Here are the commands you need to run:

sudo su

su lightdm -s /bin/bash

dbus-launch gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout 0

exit

exit

Note that this only disables sleep for the machine when on AC power. Since I am using a desktop machine, this was sufficient. If you also want to disable sleeping when on battery power, you also need to set the sleep-inactive-battery-timeout value to 0.

After your have run these commands, restart LightDM and you should be good to go.

sudo service lightdm restart