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ACPI: ibm-acpi: improve backlight power handling

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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@hmh.eng.br>
Acked-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh 2007-03-08 05:28:15 -03:00 committed by Len Brown
parent 2bc808a8c4
commit c9bf296b64
1 changed files with 5 additions and 1 deletions
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6
drivers/acpi/ibm_acpi.c
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@ -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 = {