ACPI: video: Don't call absent methods

Signed-off-by: Ryan May <rmay@ou.edu>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 3c9bb85a6a93..83aa41c5c59f 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -409,14 +409,16 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 static int
 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 {
-        int status;
+        int status = AE_OK;
         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
         struct acpi_object_list args = { 1, &arg0 };
 
 
         arg0.integer.value = level;
-        status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
-
+        if (device->cap._BCM)
+                status = acpi_evaluate_object(device->dev->handle, "_BCM",
+                                              &args, NULL);
+        device->brightness->curr = level;
         printk(KERN_DEBUG "set_level status: %x\n", status);
         return status;
 }
@@ -425,11 +427,11 @@ static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                         unsigned long *level)
 {
-        int status;
-
-        status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
-
-        return status;
+        if (device->cap._BQC)
+                return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
+                                             level);
+        *level = device->brightness->curr;
+        return AE_OK;
 }
 
 static int