xflock4 does not turn off screen due to lack of sleep

Submitted by Chris Bainbridge

Assigned to Simon Steinbeiß @ochosi

Link to original bug (#11491)

Description

As noted at http://www.shallowsky.com/linux/x-screen-blanking.html calls to "xset dpms" need to be prefixed with "sleep 1":

will blank the screen (or activate the screensaver program, if you're using
one) after a delay of one second. You need the delay because X gets a little
confused about the order of events; it will blank the screen but immediate
un-blank it, thinking the activity of your typing the command happened
recently enough to come out of screensaver mode.

sleep 1; xset dpms force off

will turn the screen OFF after a delay of one second. You can also use
standby, suspend, or on instead of off.

Downstream bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776674

Version: 4.10.1