From bd079a2cc5afe3d980f054a72bc08dbbe17c216c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Micha=C5=82=20K=C4=99pie=C5=84?= Date: Wed, 5 Apr 2017 08:49:04 +0200 Subject: [PATCH] platform/x86: fujitsu-laptop: sync brightness in set_lcd_level() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When using brightness keys and backlight device's sysfs interface alternately, an incorrect input event might be generated for a brightness key press. Consider the following sequence of events: 1. Set backlight brightness to 6 using brightness keys. 2. Write 4 to /sys/class/backlight/fujitsu-laptop/brightness. 3. Press the "brightness up" key. The input event generated in this scenario would be KEY_BRIGHTNESSDOWN, because before step 3 brightness_level would still be at 6. As the new brightness level is established using GBLL, it would evaluate to 5 (SBLL/SBL2 sets it to 4 in step 2 and pressing the "brightness up" key increases it by 1). This in turn would cause acpi_fujitsu_bl_notify() to observe a 6 -> 5 change, i.e. a decrease in brightness, while screen brightness would in fact be increased. Fix this by updating brightness_level in set_lcd_level. Signed-off-by: Michał Kępień Reviewed-by: Jonathan Woithe Signed-off-by: Darren Hart (VMware) --- drivers/platform/x86/fujitsu-laptop.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c index 066ffe734a5f..4c3bba0ceb04 100644 --- a/drivers/platform/x86/fujitsu-laptop.c +++ b/drivers/platform/x86/fujitsu-laptop.c @@ -369,6 +369,8 @@ static int set_lcd_level(int level) return -ENODEV; } + fujitsu_bl->brightness_level = level; + return 0; } -- 2.20.1