diff --git a/display.py b/display.py
index e363360..52de9ab 100644
--- a/display.py
+++ b/display.py
@@ -1,20 +1,30 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+import logging
+
+logging.basicConfig(level=logging.INFO, 
+format='%(asctime)s - %(levelname)s - %(message)s', 
+datefmt='%Y-%m-%d %H:%m:%S')
+
+
 import gi
 gi.require_version('Gtk', '3.0')
 gi.require_version('GdkPixbuf', '2.0')
-from gi.repository import Gtk,GdkPixbuf
+from gi.repository import Gtk,GdkPixbuf, GLib
 from io import BytesIO
 import argparse
 import threading
 import time
 from datetime import date
+import signal
 
 import requests
 
 DEFAULT_BASE = "https://www.agp8x.org/temp/new/pchart/"
 
+log = logging
+
 def today():
 	return date.today().strftime("temp_%d.%m.%Y.png")
 
@@ -27,10 +37,11 @@ class Updater(threading.Thread):
 	def run(self):
 		while not self.exit.is_set():
 			try:
+				log.info("run update")
 				self.target.update()
 			except Exception as e:
-				print(e, e.args)
-			self.exit.wait(10)
+				log.exception(e)
+			self.exit.wait(300)
 			
 
 class Window(object):
@@ -41,13 +52,17 @@ class Window(object):
 		#self.window.set_resizable(False)
 		self.window.connect("destroy", self.destroy)
 		self.window.connect("key-press-event", self.on_key)
-		self.window.connect("button-press-event", self.on_click)
-		self.window.fullscreen()
+		#self.window.connect("button-press-event", self.on_click)
 		self.args = args
+		if self.args.fullscreen:
+			log.info("use fullscreen")
+			self.window.fullscreen()
 		self.image = Gtk.Image()
 		self.window.add(self.image)
 		self.image.show()
 		self.window.show()
+		GLib.unix_signal_add(GLib.PRIORITY_DEFAULT, 
+signal.SIGINT, self.destroy)
 		
 	def destroy(self, data=None):
 		if self.updater:
@@ -58,16 +73,22 @@ class Window(object):
 		self.updater.start()
 		Gtk.main()
 	def on_click(self, widget, data=None):
+		log.info("on_click called")
 		self.update()
 	def on_key(self, event, data=None):
+		log.info("on_key called")
 		self.destroy()
 	def update(self):
+		log.info("start update")
 		filename = today()
 		url = self.args.base_url + "/" + filename
 		new_image = self.fetch_image(url)
 		self.image.set_from_pixbuf(new_image)
+		log.info("update finished")
 	def fetch_image(self, url):
+		log.info("start download")
 		response = requests.get(url)
+		log.info(f"result({url})={response.status_code}, {response.ok}")
 		with BytesIO(response.content) as buff:
 			loader = GdkPixbuf.PixbufLoader.new_with_type('png')
 			loader.write(buff.getvalue())
@@ -78,6 +99,7 @@ class Window(object):
 if __name__=="__main__":
 	parser = argparse.ArgumentParser()
 	parser.add_argument("base_url", nargs="?", default=DEFAULT_BASE)
+	parser.add_argument("-f", "--fullscreen", action="store_false", help="don't start in fullscreen")
 	args = parser.parse_args()
 	window = Window(args)
 	window.main()