diff -ru celinux-040503.vansky/drivers/char/minipc-kbd.c cel2.new/drivers/char/minipc-kbd.c
--- celinux-040503.vansky/drivers/char/minipc-kbd.c	2008-10-02 10:11:37.000000000 +0200
+++ cel2.new/drivers/char/minipc-kbd.c	2008-10-01 17:17:15.000000000 +0200
@@ -374,30 +374,22 @@
 			  scancode = KEY_RESERVED;	//wjx filter the = key 
 			  break;
 
-			case KEY_F5:
-			  if (key_down_flag && !(cur_keys[0] & (1U << 6) && cur_keys[16] & (1U << 6)))	// wjx 2008.2.27 change the lcd light (filter Fn + Ctrl + F1 change light )
-			    {
-#if 0
-			      lcd_pwm_dut = REG_PWM_DUT (0) + 60;
-			      if (lcd_pwm_dut > 300)
+			case KEY_F4:
+			  if (key_down_flag) {
+			      lcd_pwm_dut = REG_PWM_DUT (0)*2/3 ;
+			      if (lcd_pwm_dut <0)
 				lcd_pwm_dut = 0;
 			      __lcd_set_backlight_level (lcd_pwm_dut);
-#else
-			      if (REG_PWM_DUT (0) != 0)
-				{
-				  __lcd_set_backlight_level (0);	//wjx close the lcd backlight                           
-				}
-			      else
-				{
-				  __lcd_set_backlight_level (300);	//wjx open the backlight                                
-				}
-#endif
-			      fn_f5_flag = 1;
-			    }
-			  else
-			    {
-			      fn_f5_flag = 0;
 			    }
+			  scancode = KEY_RESERVED;	//wjx filter the = key 
+				break;
+			case KEY_F5:
+			  if (key_down_flag) {
+			      lcd_pwm_dut = (REG_PWM_DUT (0)+1)*3/2;
+			      if (lcd_pwm_dut > 300)
+				lcd_pwm_dut = 300;
+			      __lcd_set_backlight_level (lcd_pwm_dut);
+			}
 			  scancode = KEY_RESERVED;	//wjx filter the F5 key
 			  break;
 			case KEY_F20:
diff -ru celinux-040503.vansky/drivers/input/input.c cel2.new/drivers/input/input.c
--- celinux-040503.vansky/drivers/input/input.c	2008-10-02 10:11:37.000000000 +0200
+++ cel2.new/drivers/input/input.c	2008-09-30 20:37:50.000000000 +0200
@@ -78,9 +78,9 @@
 		return;
 		
 #ifdef CONFIG_FB_JZ		//wjx
-	if(REG_PWM_DUT(0) == 0 )		//wjx turn on the backlight if the backlight is off 
+	if((0x80&REG_PWM_CTR(0)) == 0 )		//wjx turn on the backlight if the backlight is off 
 	{
-		__lcd_set_backlight_level(300);
+		__lcd_set_backlight_level(-1); // Resume backlight with previous level
 	}
 #endif
             	
diff -ru celinux-040503.vansky/drivers/sound/ak4642en.c cel2.new/drivers/sound/ak4642en.c
--- celinux-040503.vansky/drivers/sound/ak4642en.c	2008-10-02 10:11:39.000000000 +0200
+++ cel2.new/drivers/sound/ak4642en.c	2008-10-07 20:21:31.000000000 +0200
@@ -586,6 +586,9 @@
         	codec_volume = 4;
 	else if ( val > 90 && val <= 100 )
         	codec_volume = 2;
+	val=100-val;
+	if(val>100||val<0) val=0;
+	codec_volume=2*val+(val/2)+2;
 
         i2s_codec_write(0x0a, codec_volume);
         i2s_codec_write(0x0d, codec_volume);
diff -ru celinux-040503.vansky/drivers/video/Jzlcd.h cel2.new/drivers/video/Jzlcd.h
--- celinux-040503.vansky/drivers/video/Jzlcd.h	2008-10-02 10:11:39.000000000 +0200
+++ cel2.new/drivers/video/Jzlcd.h	2008-12-15 23:21:13.000000000 +0100
@@ -825,15 +825,21 @@
 #define GPIO_PWM0 94
 //wjx
 
+#define __gpio_as_pwm()				\
+do {						\
+	REG_GPIO_GPAUR(2) &= 0xCFFFFFFF;	\
+	REG_GPIO_GPAUR(2) |= 0x10000000;	\
+} while (0)
+
 inline void __lcd_set_backlight_level(int n)
 {
-	REG_PWM_DUT(0) = n;
+	if(n>0) REG_PWM_DUT(0) = n;
 	REG_PWM_PER(0) = 299;	
 	if(n)
 	{
-//		__gpio_as_pwm();
 		__gpio_as_output(GPIO_PWM0);
 		__gpio_set_pin(GPIO_PWM0);
+		__gpio_as_pwm();
 		REG_PWM_CTR(0) = 0xbf;
 	}
 	else