[PATCH 10/11] platform/x86: fujitsu-laptop: account for backlight power when determining brightness

Michał Kępień
2017-03-30T10:37:16Z

The comment for the get_brightness backlight device callback in
include/linux/backlight.h states that it should "return the current
backlight brightness (accounting for power, fb_blank etc.)".
fujitsu-laptop violates that premise by simply returning the value to
which ACPI function GBLL evaluates to. Make sure 0 is returned when
backlight power is turned off.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
---
drivers/platform/x86/fujitsu-laptop.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index 78a39b143200..99befc1bc4f6 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -437,7 +437,7 @@ static int get_max_brightness(void)

static int bl_get_brightness(struct backlight_device *b)
{
- return get_lcd_level();
+ return b->props.power == FB_BLANK_POWERDOWN ? 0 : get_lcd_level();
}

static int bl_update_status(struct backlight_device *b)
--
2.12.1