Added WiFi power management support. Saves 0.3-0.8W at idle.

laptop-mode-tools_1.52/usr/share/laptop-mode-tools/modules/wifi-powermgmt

Index: laptop-mode-tools_1.52/usr/share/laptop-mode-tools/modules/wifi-powermgmt
diff --git a/laptop-mode-tools_1.52/usr/share/laptop-mode-tools/modules/wifi-powermgmt b/laptop-mode-tools_1.52/usr/share/laptop-mode-tools/modules/wifi-powermgmt
new file mode 100755
index 0000000000000000000000000000000000000000..2efb1a661353ffa4f6113cc99ea73319ea48ecc9
--- /dev/null
+++ b/laptop-mode-tools_1.52/usr/share/laptop-mode-tools/modules/wifi-powermgmt
@@ -0,0 +1,24 @@
+IWCONFIG=iwconfig
+
+if [ x$CONTROL_WIFI_POWER = x1 ] ; then
+    if [ $ON_AC -eq 1 ] ; then
+        power_mgmt="off"
+    else
+        power_mgmt="on"
+    fi
+
+    for DEVICE in /sys/class/net/* ; do
+        if [ -d $DEVICE/wireless ]; then
+            dev=`basename $DEVICE`
+            $IWCONFIG $dev power $power_mgmt
+            ret=$?
+            if [ "$ret" = "0" ]; then
+               log "VERBOSE" "Power Management set to $power_mgmt for $dev."
+            else
+                log "VERBOSE" "Failed to set Power Management to $power_mgmt for $dev."
+            fi
+        fi
+    done
+else
+    log "VERBOSE" "WiFi power setting is disabled."
+fi