Revert "ACPI: Ignore _BQC object when registering backlight device"

This reverts commit 7c0ea45be4f114d85ee35caeead8e1660699c46f which
caused a regression with the backlight being set to off when a laptop
doesn't have a _BQC entry to query the actual backlight value.  The code
blindly then falls back on a value of 0.

See
	http://bugzilla.kernel.org/show_bug.cgi?id=10387
	http://lkml.org/lkml/2008/4/2/366

for details.

Bisected-and-reported-by: Andrey Borzenkov <arvidjaar@mail.ru>
Cc: Zhao Yakui <yakui.zhao@intel.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Len Brown <len.brown@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 12fb44f16766f5979be78b031cd16225161e23d3..980a74188781eba10b5372934de94bef0e2a2ea2 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -713,7 +713,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 
        kfree(obj);
 
-       if (device->cap._BCL && device->cap._BCM && max_level > 0) {
+       if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
                int result;
                static int count = 0;
                char *name;