linux-kernel - [PATCH] ACPI: ibm-acpi: improve backlight power handling (v2)

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Message-ID: <20070226182604.GJ2909@khazad-dum.debian.net>
Date:	Mon, 26 Feb 2007 15:26:04 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	Jiri Kosina <jikos@...os.cz>, linux-kernel@...r.kernel.org
Subject: [PATCH] ACPI: ibm-acpi: improve backlight power handling (v2)

Improve the backlight code to emulate as much as possible the power
management events, as we are unable to really power on or power off the
backlight.

Signed-off-by: Henrique de Moraes Holschuh <hmh@....eng.br>
Cc: Richard Purdie <rpurdie@...ys.net>
---

 Waiting ACK from Richard Purdie <rpurdie@...ys.net>

 drivers/acpi/ibm_acpi.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
index e7309a6..3690136 100644
--- a/drivers/acpi/ibm_acpi.c
+++ b/drivers/acpi/ibm_acpi.c
@@ -86,6 +86,7 @@
 
 #include <linux/proc_fs.h>
 #include <linux/backlight.h>
+#include <linux/fb.h>
 #include <asm/uaccess.h>
 
 #include <linux/dmi.h>
@@ -1707,7 +1708,10 @@ static int brightness_write(char *buf)
 
 static int brightness_update_status(struct backlight_device *bd)
 {
-	return brightness_set(bd->props.brightness);
+	return brightness_set(
+		(bd->props.fb_blank == FB_BLANK_UNBLANK &&
+		 bd->props.power == FB_BLANK_UNBLANK) ?
+				bd->props.brightness : 0);
 }
 
 static struct backlight_ops ibm_backlight_data = {
-- 
1.5.0.1

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
-
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