Small change to call to startx, run in subshell. Previous solution failed to start on my setup (Ubuntu 12.10).

src/cdm-xlaunch

@@ -76,8 +76,7 @@ if $consolekit; then
     dbuspid=$(<"$dbuspidfifo"); rm -f "$dbuspidfifo"
 fi
 
-# Conform to POSIX and do not use `>&' here.
-setsid startx "$@" > /dev/null 2>&1 &
+$(setsid startx "$@" > /dev/null 2>&1) &
 
 # If wait(1) returns with a value >128, it was interrupted by kill(1),
 # so registration was sucessful.