Merge branch 'release-2.6.27' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6

* 'release-2.6.27' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6:
  acpi: fix crash in core ACPI code, triggered by CONFIG_ACPI_PCI_SLOT=y
  ACPI: thinkpad-acpi: don't misdetect in get_thinkpad_model_data() on -ENOMEM
  ACPI: thinkpad-acpi: bump up version to 0.21
  ACPI: thinkpad-acpi: add bluetooth and WWAN rfkill support
  ACPI: thinkpad-acpi: WLSW overrides other rfkill switches
  ACPI: thinkpad-acpi: prepare for bluetooth and wwan rfkill support
  ACPI: thinkpad-acpi: consolidate wlsw notification function
  ACPI: thinkpad-acpi: minor refactor on radio switch init
  Revert "ACPI: don't walk tables if ACPI was disabled"
  Revert "dock: bay: Don't call acpi_walk_namespace() when ACPI is disabled."
  Revert "Fix FADT parsing"
  ACPI : Set FAN device to correct state in boot phase
  ACPI: Ignore _BQC object when registering backlight device
  ACPI: stop complaints about interrupt link End Tags and blank IRQ descriptors

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 37b9e16710d..e8a51a1700f 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -741,7 +741,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 
         max_level = acpi_video_init_brightness(device);
 
-        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;
@@ -753,7 +753,17 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
                 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);