Unbreak native screensavers on Kindle >= 5.7.2

Which I broke the last time I touched this.
NOTE: I'm not quire sure why the bbsave/bbrestore on stop/resume did a
double check (screensaver & charging), because that effectiely disabled
it when charging, which I don't quite understand...

Also makes sure the needsScreenRefreshAfterResume flag is honored on
Kindles, because we need it on FW >= 5.7.2

Note that this *breaks* the behavior with passcode enabled, which was
unwittingly fixed in said previous changes...

re #1811

frontend/device/generic/device.lua

@@ -78,21 +78,32 @@ end
 -- ONLY used for Kindle devices
 function Device:intoScreenSaver()
     local UIManager = require("ui/uimanager")
-    if self.charging_mode == false and self.screen_saver_mode == false then
+    if self.screen_saver_mode == false then
         self.screen:saveCurrentBB()
         self.screen_saver_mode = true
     end
     UIManager:sendEvent(Event:new("FlushSettings"))
+    -- On FW >= 5.7.2, we sigstop awesome, but we need it to show stuff...
+    if os.getenv("AWESOME_STOPPED") == "yes" then
+        os.execute("killall -cont awesome")
+    end
 end
 
 -- ONLY used for Kindle devices
 function Device:outofScreenSaver()
-    if self.screen_saver_mode == true and self.charging_mode == false then
+    -- On FW >= 5.7.2, put awesome to sleep again...
+    if os.getenv("AWESOME_STOPPED") == "yes" then
+        os.execute("killall -stop awesome")
+    end
+    if self.screen_saver_mode == true then
         -- wait for native system update screen before we recover saved
         -- Blitbuffer.
         util.usleep(1500000)
         self.screen:restoreFromSavedBB()
         self:resume()
+        if self:needsScreenRefreshAfterResume() then
+            self.screen:refreshFull()
+        end
     end
     self.screen_saver_mode = false
 end

platform/kindle/koreader.sh

@@ -41,7 +41,7 @@ if [ "${INIT_TYPE}" == "upstart" ] ; then
 fi
 
 # Keep track of what we do with pillow...
-AWESOME_STOPPED="no"
+export AWESOME_STOPPED="no"
 PILLOW_HARD_DISABLED="no"
 PILLOW_SOFT_DISABLED="no"
 
@@ -297,9 +297,9 @@ if [ "${STOP_FRAMEWORK}" == "no" -a "${INIT_TYPE}" == "upstart" ] ; then
 		# NOTE: Try to leave the user with a slightly more useful FB content than our own last screen...
 		cat /var/tmp/koreader-fb.dump > /dev/fb0
 		rm -f /var/tmp/koreader-fb.dump
+		lipc-set-prop com.lab126.appmgrd start app://com.lab126.booklet.home
 		# NOTE: In case we ever need an extra full flash refresh...
 		#eips -s w=${SCREEN_X_RES},h=${SCREEN_Y_RES} -f
-		lipc-set-prop com.lab126.appmgrd start app://com.lab126.booklet.home
 	fi
 	if [ "${PILLOW_SOFT_DISABLED}" == "yes" ] ; then
 		logmsg "Restoring the status bar . . ."