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Date: Tue, 19 Apr 2016 18:36:05 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: "Brandon J. Wandersee" <brandon.wandersee@gmail.com>
cc: freebsd-questions@freebsd.org
Subject: Re: Simple devd.conf rule has no effect
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Quick followup with an improvement:

   notify 20 {
  	match "system"    "ACPI";
  	match "subsystem" "Lid";
  	match "notify"    "0x00";
  	action "/usr/bin/su wblock -c '/usr/local/bin/xlock -display :0.0 -mode qix &'"'
  	action "acpiconf -s3";
   };

It was backgrounding xlock that was important, not a delay after it 
started.