ACPI video: no warning message if "acpi_backlight=vendor" is used

AML code always sends notifications to ACPI video device,
even if we disable the ACPI backlight control by using
boot option "acpi_backlight=vendor".

In this case we should not print any warning message.
http://bugzilla.kernel.org/show_bug.cgi?id=13671#c14

Sigend-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 05dff631591c..3b063a6ac52e 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1979,6 +1979,10 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
         unsigned long long level_current, level_next;
         int result = -EINVAL;
 
+        /* no warning message if acpi_backlight=vendor is used */
+        if (!acpi_video_backlight_support())
+                return 0;
+
         if (!device->brightness)
                 goto out;