video: always update the brightness when poking "brightness"

always update props.brightness no matter the backlight is changed
via procfs, hotkeys or sysfs.

Sighed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index baa441929720..66a610d0e2f5 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -481,6 +481,7 @@ acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
         int status = AE_OK;
         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
         struct acpi_object_list args = { 1, &arg0 };
+        int state;
 
 
         arg0.integer.value = level;
@@ -489,6 +490,10 @@ acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
                                               &args, NULL);
         device->brightness->curr = level;
+        for (state = 2; state < device->brightness->count; state++)
+                if (level == device->brightness->levels[state])
+                        device->backlight->props.brightness = state - 2;
+
         return status;
 }