ACPI / video: Fix backlight taking 2 steps on a brightness up/down keypress

In various scenarious userspace will respond to brightness up/down keypresses
by increasing/decreasing the backlight brightness itself. If the kernel then
also changes the brightness this results in the brightness having changed 2
steps for a single keypress which is undesirable. See e.g. :

https://bugs.launchpad.net/gnome-settings-daemon/+bug/527157
http://askubuntu.com/questions/173921/why-does-my-thinkpad-brightness-control-skip-steps

This commit delays responding to brightness up/down keypresses by 100 ms and
if userspace in that time responds by changing the backlight itself, cancels
the kernels own handling of these keypresses, fixing the 2 steps issue.

Link: http://marc.info/?l=linux-kernel&m=140535721100839&w=2
[hdegoede@redhat.com: Move the delayed_work struct into struct
 acpi_video_device instead of having it as a global]
[hdegoede@redhat.com: Keep brightness_switch_enabled as a boolean and always
 delay the keypress handling]
Tested-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 27 insertions, 17 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 350d52a8f781..bfe1fa2fb5d1 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -204,6 +204,8 @@ struct acpi_video_device {
         struct acpi_video_device_flags flags;
         struct acpi_video_device_cap cap;
         struct list_head entry;
+        struct delayed_work switch_brightness_work;
+        int switch_brightness_event;
         struct acpi_video_bus *video;
         struct acpi_device *dev;
         struct acpi_video_device_brightness *brightness;
@@ -230,8 +232,7 @@ static int acpi_video_device_lcd_get_level_current(
                         unsigned long long *level, bool raw);
 static int acpi_video_get_next_level(struct acpi_video_device *device,
                                      u32 level_current, u32 event);
-static int acpi_video_switch_brightness(struct acpi_video_device *device,
-                                         int event);
+static void acpi_video_switch_brightness(struct work_struct *work);
 
 static bool acpi_video_use_native_backlight(void)
 {
@@ -275,6 +276,7 @@ static int acpi_video_set_brightness(struct backlight_device *bd)
         int request_level = bd->props.brightness + 2;
         struct acpi_video_device *vd = bl_get_data(bd);
 
+        cancel_delayed_work(&vd->switch_brightness_work);
         return acpi_video_device_lcd_set_level(vd,
                                 vd->brightness->levels[request_level]);
 }
@@ -1188,6 +1190,8 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
         data->device_id = device_id;
         data->video = video;
         data->dev = device;
+        INIT_DELAYED_WORK(&data->switch_brightness_work,
+                          acpi_video_switch_brightness);
 
         attribute = acpi_video_get_device_attr(video, device_id);
 
@@ -1410,15 +1414,18 @@ acpi_video_get_next_level(struct acpi_video_device *device,
         }
 }
 
-static int
-acpi_video_switch_brightness(struct acpi_video_device *device, int event)
+static void
+acpi_video_switch_brightness(struct work_struct *work)
 {
+        struct acpi_video_device *device = container_of(to_delayed_work(work),
+                             struct acpi_video_device, switch_brightness_work);
         unsigned long long level_current, level_next;
+        int event = device->switch_brightness_event;
         int result = -EINVAL;
 
         /* no warning message if acpi_backlight=vendor or a quirk is used */
         if (!acpi_video_verify_backlight_support())
-                return 0;
+                return;
 
         if (!device->brightness)
                 goto out;
@@ -1440,8 +1447,6 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
 out:
         if (result)
                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
-
-        return result;
 }
 
 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
@@ -1609,6 +1614,16 @@ static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
         return;
 }
 
+static void brightness_switch_event(struct acpi_video_device *video_device,
+                                    u32 event)
+{
+        if (!brightness_switch_enabled)
+                return;
+
+        video_device->switch_brightness_event = event;
+        schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
+}
+
 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
 {
         struct acpi_video_device *video_device = data;
@@ -1626,28 +1641,23 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
 
         switch (event) {
         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
-                if (brightness_switch_enabled)
-                        acpi_video_switch_brightness(video_device, event);
+                brightness_switch_event(video_device, event);
                 keycode = KEY_BRIGHTNESS_CYCLE;
                 break;
         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
-                if (brightness_switch_enabled)
-                        acpi_video_switch_brightness(video_device, event);
+                brightness_switch_event(video_device, event);
                 keycode = KEY_BRIGHTNESSUP;
                 break;
         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
-                if (brightness_switch_enabled)
-                        acpi_video_switch_brightness(video_device, event);
+                brightness_switch_event(video_device, event);
                 keycode = KEY_BRIGHTNESSDOWN;
                 break;
         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
-                if (brightness_switch_enabled)
-                        acpi_video_switch_brightness(video_device, event);
+                brightness_switch_event(video_device, event);
                 keycode = KEY_BRIGHTNESS_ZERO;
                 break;
         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
-                if (brightness_switch_enabled)
-                        acpi_video_switch_brightness(video_device, event);
+                brightness_switch_event(video_device, event);
                 keycode = KEY_DISPLAY_OFF;
                 break;
         default: