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Subject[PATCH] Reset ACPI backlight on resume
Some machines seem to need the backlight brightness to be reset on 
resume. Add support for doing so to the video module.

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>

---

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index b8ce6dc..09a85eb 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -74,6 +74,7 @@ MODULE_LICENSE("GPL");

static int acpi_video_bus_add(struct acpi_device *device);
static int acpi_video_bus_remove(struct acpi_device *device, int type);
+static int acpi_video_resume(struct acpi_device *device);

static const struct acpi_device_id video_device_ids[] = {
{ACPI_VIDEO_HID, 0},
@@ -88,6 +89,7 @@ static struct acpi_driver acpi_video_bus = {
.ops = {
.add = acpi_video_bus_add,
.remove = acpi_video_bus_remove,
+ .resume = acpi_video_resume,
},
};

@@ -1896,6 +1900,25 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
}

static int instance;
+static int acpi_video_resume(struct acpi_device *device)
+{
+ struct acpi_video_bus *video;
+ struct acpi_video_device *video_device;
+ int i;
+
+ if (!device || !acpi_driver_data(device))
+ return -EINVAL;
+
+ video = acpi_driver_data(device);
+
+ for (i=0; i<video->attached_count; i++) {
+ video_device = video->attached_array[i].bind_info;
+ if (video_device && video_device->backlight)
+ acpi_video_set_brightness(video_device->backlight);
+ }
+ return AE_OK;
+}
+
static int acpi_video_bus_add(struct acpi_device *device)
{
acpi_status status;
--
Matthew Garrett | mjg59@srcf.ucam.org

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