linux-kernel - Re: [PATCH] ACPI: ibm-acpi: improve backlight power handling (v2)

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Message-Id: <1172526818.24429.18.camel@localhost.localdomain>
Date:	Mon, 26 Feb 2007 21:53:38 +0000
From:	Richard Purdie <rpurdie@...ys.net>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Jiri Kosina <jikos@...os.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: ibm-acpi: improve backlight power handling (v2)

On Mon, 2007-02-26 at 15:26 -0300, Henrique de Moraes Holschuh wrote: 
> Improve the backlight code to emulate as much as possible the power
> management events, as we are unable to really power on or power off the
> backlight.
> 
> Signed-off-by: Henrique de Moraes Holschuh <hmh@....eng.br>
Acked-by: Richard Purdie <rpurdie@...ys.net>
> 
>  drivers/acpi/ibm_acpi.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/acpi/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
> index e7309a6..3690136 100644
> --- a/drivers/acpi/ibm_acpi.c
> +++ b/drivers/acpi/ibm_acpi.c
> @@ -86,6 +86,7 @@
>  
>  #include <linux/proc_fs.h>
>  #include <linux/backlight.h>
> +#include <linux/fb.h>
>  #include <asm/uaccess.h>
>  
>  #include <linux/dmi.h>
> @@ -1707,7 +1708,10 @@ static int brightness_write(char *buf)
>  
>  static int brightness_update_status(struct backlight_device *bd)
>  {
> -	return brightness_set(bd->props.brightness);
> +	return brightness_set(
> +		(bd->props.fb_blank == FB_BLANK_UNBLANK &&
> +		 bd->props.power == FB_BLANK_UNBLANK) ?
> +				bd->props.brightness : 0);
>  }
>  
>  static struct backlight_ops ibm_backlight_data = {


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