Commit bd079a2c authored by Michał Kępień's avatar Michał Kępień Committed by Darren Hart (VMware)

platform/x86: fujitsu-laptop: sync brightness in set_lcd_level()

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: default avatarMichał Kępień <kernel@kempniu.pl>
Reviewed-by: default avatarJonathan Woithe <jwoithe@just42.net>
Signed-off-by: default avatarDarren Hart (VMware) <dvhart@infradead.org>
parent a8779c35
...@@ -369,6 +369,8 @@ static int set_lcd_level(int level) ...@@ -369,6 +369,8 @@ static int set_lcd_level(int level)
return -ENODEV; return -ENODEV;
} }
fujitsu_bl->brightness_level = level;
return 0; return 0;
} }
......
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