> 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@alessandroguido.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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