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ACPI: Ignore _BQC object when registering backlight device

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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>
This commit is contained in:
Zhao Yakui 2008-07-17 10:46:05 +08:00 committed by Andi Kleen
parent 4a5e3638b1
commit c2c789057f
1 changed files with 12 additions and 2 deletions
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14
drivers/acpi/video.c
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@ -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);