From a60cfc4e10afb804bcd0da832472b3566cd73b31 Mon Sep 17 00:00:00 2001
From: chrox <chrox.huang@gmail.com>
Date: Sat, 20 Apr 2013 11:08:12 +0800
Subject: [PATCH] fix occasionally failed lipc invocation

---
 frontend/ui/reader/readerfrontlight.lua | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/frontend/ui/reader/readerfrontlight.lua b/frontend/ui/reader/readerfrontlight.lua
index 5ec22c1f9..498340704 100644
--- a/frontend/ui/reader/readerfrontlight.lua
+++ b/frontend/ui/reader/readerfrontlight.lua
@@ -11,7 +11,9 @@ function ReaderFrontLight:init()
 	if dev_mod == "KindlePaperWhite" then
 		require "liblipclua"
 		self.lipc_handle = lipc.init("com.github.koreader")
-		self.intensity = self.lipc_handle:get_int_property("com.lab126.powerd", "flIntensity")
+		if self.lipc_handle then
+			self.intensity = self.lipc_handle:get_int_property("com.lab126.powerd", "flIntensity")
+		end
 	end
 	self.ges_events = {
 		Adjust = {
@@ -29,7 +31,7 @@ function ReaderFrontLight:init()
 end
 
 function ReaderFrontLight:onAdjust(arg, ges)
-	if self.lipc_handle then
+	if self.lipc_handle and self.intensity ~=nil then
 		local rel_proportion = ges.distance / Screen:getWidth()
 		local delta_int = self.steps[math.ceil(#self.steps*rel_proportion)]
 		local msg = ""