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path: root/drivers/acpi/acpi_video.c
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Diffstat (limited to 'drivers/acpi/acpi_video.c')
-rw-r--r--drivers/acpi/acpi_video.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index e07782b1fbb6..43177c20ce4f 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -73,6 +73,7 @@ module_param(device_id_scheme, bool, 0444);
static int only_lcd = -1;
module_param(only_lcd, int, 0444);
+static bool has_backlight;
static int register_count;
static DEFINE_MUTEX(register_count_mutex);
static DEFINE_MUTEX(video_list_lock);
@@ -1222,6 +1223,9 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
acpi_video_device_bind(video, data);
acpi_video_device_find_cap(data);
+ if (data->cap._BCM && data->cap._BCL)
+ has_backlight = true;
+
mutex_lock(&video->device_list_lock);
list_add_tail(&data->entry, &video->video_device_list);
mutex_unlock(&video->device_list_lock);
@@ -2249,6 +2253,7 @@ void acpi_video_unregister(void)
if (register_count) {
acpi_bus_unregister_driver(&acpi_video_bus);
register_count = 0;
+ has_backlight = false;
}
mutex_unlock(&register_count_mutex);
}
@@ -2270,13 +2275,7 @@ void acpi_video_unregister_backlight(void)
bool acpi_video_handles_brightness_key_presses(void)
{
- bool have_video_busses;
-
- mutex_lock(&video_list_lock);
- have_video_busses = !list_empty(&video_bus_head);
- mutex_unlock(&video_list_lock);
-
- return have_video_busses &&
+ return has_backlight &&
(report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
}
EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);