linux-kernel - [PATCH 2/3] ACPI: Update the backlight state when we change brightness

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Message-Id: <1247587564-27737-2-git-send-email-mjg@redhat.com>
Date:	Tue, 14 Jul 2009 17:06:03 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-acpi@...r.kernel.org, rpurdie@...ys.net, lenb@...nel.org,
	rui.zhang@...el.com, corentincj@...aif.net,
	Matthew Garrett <mjg@...hat.com>
Subject: [PATCH 2/3] ACPI: Update the backlight state when we change brightness

Trigger a status update when we change the brightness in the driver, thus
allowing userspace to present appropriate UI.

Signed-off-by: Matthew Garrett <mjg@...hat.com>
---
 drivers/acpi/video.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 8851315..2c906c7 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1960,6 +1960,10 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
 
 	result = acpi_video_device_lcd_set_level(device, level_next);
 
+	if (!result)
+		backlight_force_update(device->backlight,
+				       BACKLIGHT_UPDATE_HOTKEY);
+
 out:
 	if (result)
 		printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
-- 
1.6.2.5

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