asus-acpi: fingers off backlight if video.ko is serving this functionality

Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/misc/asus-laptop.c b/drivers/misc/asus-laptop.c
index a9d5228724a6..8fb8b3591048 100644
--- a/drivers/misc/asus-laptop.c
+++ b/drivers/misc/asus-laptop.c
@@ -1208,9 +1208,13 @@ static int __init asus_laptop_init(void)
 
         dev = acpi_get_physical_device(hotk->device->handle);
 
-        result = asus_backlight_init(dev);
-        if (result)
-                goto fail_backlight;
+        if (!acpi_video_backlight_support()) {
+                result = asus_backlight_init(dev);
+                if (result)
+                        goto fail_backlight;
+        } else
+                printk(ASUS_INFO "Brightness ignored, must be controlled by "
+                       "ACPI video driver\n");
 
         result = asus_led_init(dev);
         if (result)