linux-kernel - Re: [sony-laptop] Fix regression caused by "sony-laptop: fingers off backlight if video.ko is serving this functionality"

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Date:	Thu, 13 Nov 2008 00:56:09 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Alessandro Guido <ag@...ssandroguido.name>
Cc:	trenn@...e.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: [sony-laptop] Fix regression caused by
 "sony-laptop: fingers off backlight if video.ko is serving this functionality"

applied.

thanks for testing!

-Len

On Wed, 12 Nov 2008, Alessandro Guido wrote:

> After commit 540b8bb9c33935183ceb5bed466a42ad72b2af56:
> 
>   sony-laptop: fingers off backlight if video.ko is serving this functionality
> 
> I can't set brightness on my sony laptop (nothing in /sys/class/backlight).
> dmesg says "sony-laptop: Sony: Brightness ignored, must be controlled by ACPI
> video driver".
> The function acpi_video_backlight_support returns 0 if we should use the
> vendor-specific backlight support, while non-0 if the ACPI generic should
> be used. Because of this, the check introduced by the said commit appears
> reversed.
> 
> Signed-off-by: Alessandro Guido <ag@...ssandroguido.name>
> ---
> diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
> index 7bcb810..2a613d4 100644
> --- a/drivers/misc/sony-laptop.c
> +++ b/drivers/misc/sony-laptop.c
> @@ -1038,7 +1038,7 @@ static int sony_nc_add(struct acpi_device *device)
>  		goto outinput;
>  	}
>  
> -	if (!acpi_video_backlight_support()) {
> +	if (acpi_video_backlight_support()) {
>  		printk(KERN_INFO DRV_PFX "Sony: Brightness ignored, must be "
>  		       "controlled by ACPI video driver\n");
>  	} else if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT",
> 
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