1 files changed, 39 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/3890-drm-amd-display-Restore-backlight-brightness-after-s.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/3890-drm-amd-display-Restore-backlight-brightness-after-s.patch
new file mode 100644
index 00000000..23523b6b
--- /dev/null
+++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/3890-drm-amd-display-Restore-backlight-brightness-after-s.patch
@@ -0,0 +1,39 @@
+From e134bf7296d335ed5a1f3ac332eb766057bfd866 Mon Sep 17 00:00:00 2001
+From: Kai-Heng Feng <kai.heng.feng@canonical.com>
+Date: Mon, 2 Sep 2019 16:33:42 +0800
+Subject: [PATCH 3890/4256] drm/amd/display: Restore backlight brightness after
+ system resume
+
+Laptops with AMD APU doesn't restore display backlight brightness after
+system resume.
+
+This issue started when DC was introduced.
+
+Let's use BL_CORE_SUSPENDRESUME so the backlight core calls
+update_status callback after system resume to restore the backlight
+level.
+
+Tested on Dell Inspiron 3180 (Stoney Ridge) and Dell Latitude 5495
+(Raven Ridge).
+
+Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+---
+ drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+index 05eb21d76cc6..3e75028529d1 100644
+--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
++++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+@@ -2161,6 +2161,7 @@ static int amdgpu_dm_backlight_get_brightness(struct backlight_device *bd)
+ }
+ 
+ static const struct backlight_ops amdgpu_dm_backlight_ops = {
++	.options = BL_CORE_SUSPENDRESUME,
+ 	.get_brightness = amdgpu_dm_backlight_get_brightness,
+ 	.update_status	= amdgpu_dm_backlight_update_status,
+ };
+-- 
+2.17.1
+