[PATCH 09/11] sony-laptop: fingers off backlight if video.ko is serving this functionality

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Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
---
 drivers/misc/sony-laptop.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 00e48e2..32675cb 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -1037,7 +1037,11 @@ static int sony_nc_add(struct acpi_device *device)
 		goto outinput;
 	}
 
-	if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT", &handle))) {
+	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",
+						&handle))) {
 		sony_backlight_device = backlight_device_register("sony", NULL,
 								  NULL,
 								  &sony_backlight_ops);
-- 
1.5.4.5

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