From 4e811057f31a4bf1ea1639428bfcaa35c5cfeb6b Mon Sep 17 00:00:00 2001
From: Mike Blumenkrantz <zmike@osg.samsung.com>
Date: Mon, 21 Sep 2015 17:19:53 -0400
Subject: [PATCH] add eeze watch for backlight events

when using "system" backlight mode, ensure that events are processed
as they occur so that the available backlight level is in sync with
the actual backlight level

fix T2255
---
 src/bin/e_backlight.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/bin/e_backlight.c b/src/bin/e_backlight.c
index f510ad2bb..89552e3c9 100644
--- a/src/bin/e_backlight.c
+++ b/src/bin/e_backlight.c
@@ -253,6 +253,7 @@ _e_backlight_update(void)
    if (bl_sysval)
      {
         sysmode = MODE_SYS;
+        xbl_avail = EINA_FALSE;
         _bl_sys_level_get();
         return;
      }
@@ -337,6 +338,17 @@ _bl_anim(void *data EINA_UNUSED, double pos)
 }
 
 #ifdef HAVE_EEZE
+static void
+_bl_sys_change(const char *device, Eeze_Udev_Event event EINA_UNUSED, void *data EINA_UNUSED, Eeze_Udev_Watch *watch EINA_UNUSED)
+{
+   if (device == bl_sysval)
+     {
+        _bl_sys_level_get();
+        ecore_event_add(E_EVENT_BACKLIGHT_CHANGE, NULL, NULL, NULL);
+     }
+   eina_stringshare_del(device);
+}
+
 static void
 _bl_sys_find(void)
 {
@@ -421,6 +433,7 @@ _bl_sys_find(void)
      }
    /* clear out preferred devs list */
    E_FREE_LIST(pdevs, eina_stringshare_del);
+   eeze_udev_watch_add(EEZE_UDEV_TYPE_BACKLIGHT, EEZE_UDEV_EVENT_CHANGE, _bl_sys_change, NULL);
 }
 
 static void