Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1616633

[PATCH v2 05/11] platform/x86: fujitsu-laptop: sync brightness in set_lcd_level()

Show all headers | View raw

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 <kernel@kempniu.pl>
---
 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 6d4a2a36716b..b019060d6dc4 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -384,6 +384,8 @@ static int set_lcd_level(int level)
 		return -ENODEV;
 	}
 
+	fujitsu_bl->brightness_level = level;
+
 	return 0;
 }
 
-- 
2.12.2

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 00/11] fujitsu-laptop: backlight cleanup Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 11/11] platform/x86: fujitsu-laptop: remove redundant fields from struct fujitsu_bl Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 10/11] platform/x86: fujitsu-laptop: account for backlight power when determining brightness Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 07/11] platform/x86: fujitsu-laptop: make disable_brightness_adjust a boolean Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 08/11] platform/x86: fujitsu-laptop: ignore errors when setting backlight power Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 06/11] platform/x86: fujitsu-laptop: clean up use_alt_lcd_levels handling Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 02/11] platform/x86: fujitsu-laptop: switch to a managed backlight device Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 04/11] platform/x86: fujitsu-laptop: simplify set_lcd_level() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 05/11] platform/x86: fujitsu-laptop: sync brightness in set_lcd_level() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 01/11] platform/x86: fujitsu-laptop: only handle backlight when appropriate Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 09/11] platform/x86: fujitsu-laptop: do not log set_lcd_level() failures in bl_update_status() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 03/11] platform/x86: fujitsu-laptop: merge set_lcd_level_alt() into set_lcd_level() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
    Re: [PATCH v2 03/11] platform/x86: fujitsu-laptop: merge  set_lcd_level_alt() into set_lcd_level() Jonathan Woithe <jwoithe@just42.net> - 2017-04-07 14:00 +0200
      Re: [PATCH v2 03/11] platform/x86: fujitsu-laptop: merge  set_lcd_level_alt() into set_lcd_level() Jonathan Woithe <jwoithe@just42.net> - 2017-04-07 14:10 +0200
  Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Darren Hart <dvhart@infradead.org> - 2017-04-05 17:40 +0200
    Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Michał Kępień <kernel@kempniu.pl> - 2017-04-05 22:00 +0200
      Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Jonathan Woithe <jwoithe@just42.net> - 2017-04-06 02:50 +0200
        Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Darren Hart <dvhart@infradead.org> - 2017-04-06 05:10 +0200
          Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Jonathan Woithe <jwoithe@just42.net> - 2017-04-07 14:20 +0200
            Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Darren Hart <dvhart@infradead.org> - 2017-04-07 20:00 +0200

csiph-web