Proxmox

Display off on NB

Step 1: Edit Grub Configuration:

In your text editor of choice, edit the grub configuration. Grub is the bootloader used by Proxmox. You’re going to add “consoleblank=30” to the GRUB_CMDLINE_LINUX_DEFAULT line. Open /etc/default/grub using your editor of choice:

nano /etc/default/grub

On my install, the GRUB_CMDLINE_LINUX-DEFAULT line already had one value, “quiet”. I edited this so the final result was as follows:

GRUB_CMDLINE_LINUX_DEFAULT="quiet consoleblank=30"

Assuming you’re using nano, save the changes with Ctrl+O, Enter, and then quit nano with Ctrl+X. Now, you need to update grub for the changes you made to take effect.

update-grub

Great! Now, reboot your “server”, ahem, laptop, for the changes to take effect. Now, after 30 seconds of no keyboard input, the display will turn off. Just press any key to wake up the system, if you need to use the screen. Hope this was helpful!

Source: https://michaelstaake.com/proxmox-on-a-laptop-turning-off-the-screen/ thx ^^