releases/2.6.26.7/acpi-ignore-_bqc-object-when-registering-backlight-device.patch

From lenb@kernel.org  Fri Oct 17 16:33:15 2008
From: Zhao Yakui <yakui.zhao@intel.com>
Date: Fri, 17 Oct 2008 02:16:41 -0400 (EDT)
Subject: ACPI: Ignore _BQC object when registering backlight device
To: stable@kernel.org
Cc: Zhao Yakui <yakui.zhao@intel.com>, linux-acpi@vger.kernel.org
Message-ID: <alpine.LFD.1.10.0810170213450.3026@localhost.localdomain>


From: Zhao Yakui <yakui.zhao@intel.com>

upstream commmit: c2c789057f075022658b38b498755c29c1ba8055

According to acpi spec , the objectes of  _BCL and _BCM are required if
integrated LCD is present and supports brightness level and the _BQC is
the optional object. So the _BQC object will be ignored when the backlight
device is registered.
At the same time when there is no _BQC object, the current brightness will be
set to the maximum.

http://bugzilla.kernel.org/show_bug.cgi?id=10206

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Zhang Rui  <rui.zhang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/acpi/video.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -720,7 +720,7 @@ static void acpi_video_device_find_cap(s
 
 	kfree(obj);
 
-	if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
+	if (device->cap._BCL && device->cap._BCM && max_level > 0) {
 		int result;
 		static int count = 0;
 		char *name;
@@ -732,7 +732,17 @@ static void acpi_video_device_find_cap(s
 		device->backlight = backlight_device_register(name,
 			NULL, device, &acpi_backlight_ops);
 		device->backlight->props.max_brightness = device->brightness->count-3;
-		device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
+		/*
+		 * If there exists the _BQC object, the _BQC object will be
+		 * called to get the current backlight brightness. Otherwise
+		 * the brightness will be set to the maximum.
+		 */
+		if (device->cap._BQC)
+			device->backlight->props.brightness =
+				acpi_video_get_brightness(device->backlight);
+		else
+			device->backlight->props.brightness =
+				device->backlight->props.max_brightness;
 		backlight_update_status(device->backlight);
 		kfree(name);