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I would like to have the display turn off while not logged into the system.
I can't find an easy way to do this.
I am new to Linux, and I tried this command

setterm --blank 5

and added it to crontab, but it does not work.

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Update: Found a workaround

Open /etc/default/grub in your favorite editor; you will need to use sudo (for vi, nano, etc.) or gksudo (for gedit, etc.).

Then add consoleblank=0 to the GRUB_CMDLINE_LINUX_DEFAULT=, parameter.

e.g. yours may say:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash consoleblank=0" Then run sudo update-grub, and reboot.

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