You need to unbind the Meta+L from the standard lock screen and map it to the following script:
#!/bin/bash
xset dpms force off
loginctl lock-session 1
xset dpms force off

You need to unbind the Meta+L from the standard lock screen and map it to the following script:
#!/bin/bash
xset dpms force off
loginctl lock-session 1
xset dpms force off
