diff --git a/einkfb.c b/einkfb.c
index e1a71002e..b0fcf205a 100644
--- a/einkfb.c
+++ b/einkfb.c
@@ -23,6 +23,11 @@
 
 #include "einkfb.h"
 
+#ifdef EMULATE_READER
+	int emu_w = EMULATE_READER_W;
+	int emu_h = EMULATE_READER_H;
+#endif	
+
 static int openFrameBuffer(lua_State *L) {
 	const char *fb_device = luaL_checkstring(L, 1);
 	FBInfo *fb = (FBInfo*) lua_newuserdata(L, sizeof(FBInfo));
@@ -89,14 +94,14 @@ static int openFrameBuffer(lua_State *L) {
 	if(SDL_Init(SDL_INIT_VIDEO) < 0) {
 		return luaL_error(L, "cannot initialize SDL.");
 	}
-	if(!(fb->screen = SDL_SetVideoMode(EMULATE_READER_W, EMULATE_READER_H, 32, SDL_HWSURFACE))) {
+	if(!(fb->screen = SDL_SetVideoMode(emu_w, emu_h, 32, SDL_HWSURFACE))) {
 		return luaL_error(L, "can't get video surface %dx%d for 32bpp.",
-				EMULATE_READER_W, EMULATE_READER_H);
+				emu_w, emu_h);
 	}
-	fb->vinfo.xres = EMULATE_READER_W;
-	fb->vinfo.yres = EMULATE_READER_H;
-	fb->buf->pitch = (EMULATE_READER_W + 1) / 2;
-	fb->buf->data = calloc(fb->buf->pitch * EMULATE_READER_H, sizeof(char));
+	fb->vinfo.xres = emu_w;
+	fb->vinfo.yres = emu_h;
+	fb->buf->pitch = (emu_w + 1) / 2;
+	fb->buf->data = calloc(fb->buf->pitch * emu_h, sizeof(char));
 	if(fb->buf->data == NULL) {
 		return luaL_error(L, "cannot get framebuffer emu memory");
 	}
@@ -191,7 +196,6 @@ static int einkUpdate(lua_State *L) {
 /* NOTICE!!! You must close and reopen framebuffer after called this method.
  * Otherwise, screen resolution will not be updated! */
 static int einkSetOrientation(lua_State *L) {
-#ifndef EMULATE_READER
 	FBInfo *fb = (FBInfo*) luaL_checkudata(L, 1, "einkfb");
 	int mode = luaL_optint(L, 2, 0);
 
@@ -199,6 +203,7 @@ static int einkSetOrientation(lua_State *L) {
 		return luaL_error(L, "Wrong rotation mode %d given!", mode);
 	}
 
+#ifndef EMULATE_READER
 	/* ioctl has a different definition for rotation mode. */
 	if (mode == 1) 
 		mode = 2;
@@ -206,6 +211,15 @@ static int einkSetOrientation(lua_State *L) {
 		mode = 1;
 
 	ioctl(fb->fd, FBIO_EINK_SET_DISPLAY_ORIENTATION, mode);
+#else
+	if (mode == 0 || mode == 2) {
+		emu_w = EMULATE_READER_W;
+		emu_h = EMULATE_READER_H;
+	}	
+	else if (mode == 1 || mode == 3) {
+		emu_w = EMULATE_READER_H;
+		emu_h = EMULATE_READER_W;
+	}
 #endif
 	return 0;
 }
diff --git a/reader.lua b/reader.lua
index 900de1fc0..ab9ef670e 100755
--- a/reader.lua
+++ b/reader.lua
@@ -116,11 +116,14 @@ end
 G_screen_saver_mode = false
 G_charging_mode = false
 fb = einkfb.open("/dev/fb0")
-G_width, G_height = fb:getSize()
 -- read current rotation mode
 Screen:updateRotationMode()
 Screen.native_rotation_mode = Screen.cur_rotation_mode
 
+-- force portrait mode
+Screen:setRotationMode(0)
+G_width, G_height = fb:getSize()
+
 -- set up reader's setting: font
 G_reader_settings = DocSettings:open(".reader")
 fontmap = G_reader_settings:readSetting("fontmap")
diff --git a/screen.lua b/screen.lua
index c46ba57b2..1f1184e53 100644
--- a/screen.lua
+++ b/screen.lua
@@ -47,6 +47,19 @@ Screen = {
 	saved_bb = nil,
 }
 
+function Screen:setRotationMode(mode)
+	if mode < 0 or mode > 3 then
+		Debug("Illegal mode parameter to Screen:setRotatonMode()!")
+		return
+	end
+
+	self.cur_rotation_mode = mode
+	-- you have to reopen framebuffer after rotate
+	fb:setOrientation(self.cur_rotation_mode)
+	fb:close()
+	fb = einkfb.open("/dev/fb0")
+end
+
 -- @orien: 1 for clockwise rotate, -1 for anti-clockwise
 -- Remember to reread screen resolution after this function call
 function Screen:screenRotate(orien)
diff --git a/unireader.lua b/unireader.lua
index 3b078f93e..c4a90beaa 100644
--- a/unireader.lua
+++ b/unireader.lua
@@ -1876,6 +1876,14 @@ function UniReader:screenRotate(orien)
 	self:clearCache()
 end
 
+function UniReader:setRotationMode(mode)
+	Screen:setRotationMode(mode)
+	-- update global width and height variable
+	G_width, G_height = fb:getSize()
+	self:clearCache()
+end
+
+
 function UniReader:cleanUpTocTitle(title)
 	return (title:gsub("\13", ""))
 end
@@ -2487,6 +2495,7 @@ function UniReader:inputLoop()
 	self.toc_cview = nil
 	self.toc_curidx_to_x = nil
 	self.show_overlap = 0
+	self:setRotationMode(0)
 	self:setDefaults()
 	if self.doc ~= nil then
 		self.doc:close()