Set backlight always on

Hi,

I have a mini2440 with a 7' LCD running a custom Angstrom distribution with
kernel 2.6.31.1. I am running Xorg with framebuffer.

I'm trying to make my backlight always on without success.

Here are some options that are set in my kernel config:

CONFIG_FB_S3C2410=y
CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_LCD_CLASS_DEVICE=y
CONFIG_LCD_PLATFORM=y
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_PWM=y
CONFIG_FB=y
CONFIG_FB_MODE_HELPERS=y
CONFIG_FB_TILEBLITTING=y
CONFIG_FRAMEBUFFER_CONSOLE=y

Does anyone have an idea how can I do it?

Thank you,

Cyrille

CONFIG_FRAMEBUFFER_CONSOLE is responsible for the backlight switch off you
see.

Thank you for your answer.

I tried your suggestion but if I remove CONFIG_FRAMEBUFFER_CONSOLE, X
doesn't start anymore and my screen is all scrambled (just like if you set
a wrong screen as kernel parameter: mini2440=0tb).

If I try with qemu, the screen stays black during bootup and when I start
X, qemu crash.

However, if I set mini2440 to 0tb as kernel parameter in qemu (I cannot
test with a real lcd), all is running great.

Hi

Try passing kernel parameter consoleblank=0 

thanks
--fatbrain

When you disable CONFIG_FRAMEBUFFER_CONSOLE you need this patch:

Index: linux-3.0/drivers/video/s3c2410fb.c
===================================================================
--- linux-3.0.orig/drivers/video/s3c2410fb.c
+++ linux-3.0/drivers/video/s3c2410fb.c
@@ -982,6 +982,9 @@ static int __devinit s3c24xxfb_probe(str
     dev_err(&pdev->dev, "failed to add debug attribute\n");
   }
 #endif
+#ifndef CONFIG_FRAMEBUFFER_CONSOLE
+  s3c2410fb_set_par(fbinfo);
+#endif
   pr_info("fb%d: %s frame buffer device\n",
     fbinfo->node, fbinfo->fix.id);

Hello,

Thank you for your help, It's working with the patch.

Regards