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

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Message-Id: <200811122303.29372.ag@alessandroguido.name>
Date:	Wed, 12 Nov 2008 23:03:28 +0100
From:	Alessandro Guido <ag@...ssandroguido.name>
To:	len.brown@...el.com
Cc:	trenn@...e.de, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: [sony-laptop] Fix regression caused by "sony-laptop: fingers off backlight if video.ko is serving this functionality"

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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