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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Message-Id: <200811121627.13525.trenn@suse.de>
Date:	Wed, 12 Nov 2008 16:27:12 -0600
From:	Thomas Renninger <trenn@...e.de>
To:	Alessandro Guido <ag@...ssandroguido.name>
Cc:	len.brown@...el.com, 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"

On Wednesday 12 November 2008 04:03:28 pm 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>

Thanks for finding this stupid typo,

       Thomas

> ---
> 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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