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I have program which is starting on boot when raspberry powered up. What I want to do is prevent someone to plug a hdmi cable and see desktop of raspberry. Is it possible to set screensaver? Of course it should ask a password to unlock the screensaver?

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  • On what OS + version? Do you use a GUI/Desktop? Please update your question with these and other relevant details. Commented Nov 15, 2018 at 9:16
  • If you use Raspbian with Desktop then xscreensaver may work for you. Install it with sudo apt install Commented Nov 15, 2018 at 10:30

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Open the terminal on Raspberry Pi itself or you can do this in SSH also:

sudo pkill -f lxsession

GUI session will logout and display the Login screen. SSH session will remain logged in.

If you want to blank the display, type following in the terminal:

xset -display :0 dpms force off

note:

  • this will work only if the desktop session is logged in
  • The screen will turn on if the mouse or keyboard is used.

This command will disable HDMI port

To disable port 

vcgencmd display_power 0

To enable port

vcgencmd display_power 1
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  • This does not really answer the question. However +1 for the good alternatives. Commented Nov 15, 2018 at 19:24

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