Add a new sysctl machdep.lidaction. The sysctl works as follows:

machdep.lidaction=0	# do nothing
machdep.lidaction=1	# suspend
machdep.lidaction=2	# hibernate
lidsuspend is just an alias for lidaction, so if you change one, the
other one will have the same value. The plan is to remove
machdep.lidsuspend eventually when people have upgraded their
/ets/sysctl.conf.
discussed with deraadt, who came up with the new MIB name
no objections mlarkin
ok stsp halex jcs

src/etc/etc.amd64/sysctl.conf

@@ -1,3 +1,3 @@
 #machdep.allowaperture=2	# See xf86(4)
 #machdep.kbdreset=1		# permit console CTRL-ALT-DEL to do a nice halt
-#machdep.lidsuspend=0		# do not suspend laptop upon lid closing
+#machdep.lidaction=0		# 1=suspend, 2=hibernate laptop upon lid closing

src/etc/etc.i386/sysctl.conf

@@ -1,4 +1,4 @@
 #machdep.allowaperture=2	# See xf86(4)
 #machdep.apmhalt=1		# 1=powerdown hack, try if halt -p doesn't work
 #machdep.kbdreset=1		# permit console CTRL-ALT-DEL to do a nice halt
-#machdep.lidsuspend=0		# do not suspend laptop upon lid closing
+#machdep.lidaction=0		# 1=suspend, 2=hibernate laptop upon lid closing

src/etc/etc.loongson/sysctl.conf

@@ -1 +1 @@
-#machdep.lidsuspend=0		# do not suspend laptop upon lid closing
+#machdep.lidaction=0		# 1=suspend, 2=hibernate laptop upon lid closing