backlight: Fix dimmed display doesn't go to sleep

commit 246bf4af75bf7c30fc1ea6ca346a050008790d94
Author: Petr Mikhalicin <[email protected]>
Date:   Sat Jan 3 20:16:20 2026 +0500

    backlight: Fix dimmed display doesn't go to sleep
    
    Firmware didn't start sleep countdown if
    1. Display was already dimmed
    2. Fade out timer was set
    
    You can reproduce this by:
    1. Set fade out timer. For example, 500ms
    2. Wait till display will be dimmed and go to sleep
    3. Switch hold ON or plug headphones
    
    Change-Id: I27ca857aa8db4551bd9caad4815cd73a64bf6185

diff --git a/firmware/backlight.c b/firmware/backlight.c
index a00483c070..ee7b147aee 100644
--- a/firmware/backlight.c
+++ b/firmware/backlight.c
@@ -387,7 +387,8 @@ static void backlight_setup_fade_up(void)
 
 static void backlight_setup_fade_down(void)
 {
-    if (bl_fade_out_step > 0)
+    /* Start fading display if it's not dimmed yet */
+    if (bl_fade_out_step > 0 && bl_dim_current > 0)
     {
         backlight_dim(0);
     }
-- 
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