The [[!template id=man name="powerd" section="8"]] daemon acts upon power management events posted by the kernel's power management facility, translating the events into a script name and arguments. These scripts are found in `/etc/powerd/scripts/`.
The `lid_switch` script is called on lid-open and -close events. An event of `pressed` means the lid has been closed, and `released` that the lid has been opened.
The following `lid_switch` uses [[!template id=man name="xset" section="1"]] to forcibly blank the screen on lid-close, and refresh the screen on lid-open:
[[!template id=programlisting text="""
#!/bin/sh
# arguments passed by powerd(8): device event
# debugging: exec 1>>/tmp/lid_switch.log 2>&1
if [ -z "$DISPLAY" ]; then export DISPLAY=:0; fi
case "${2}" in
pressed) # lid closed
/usr/X11R6/bin/xset dpms force off
exit 0
;;
released) # lid opened
# need to both force dpms and reset screensaver
/usr/X11R6/bin/xset dpms force on
/usr/X11R6/bin/xset s reset
exit 0
;;
*)
logger -p warning "${0}: unsupported event ${2} on device ${1}" >&1
exit 1
;;
esac
"""]]
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