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Message-Id: <20191003154530.869163725@linuxfoundation.org>
Date: Thu, 3 Oct 2019 17:54:37 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Kai-Heng Feng <kai.heng.feng@...onical.com>,
Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 4.19 211/211] drm/amd/display: Restore backlight brightness after system resume
From: Kai-Heng Feng <kai.heng.feng@...onical.com>
commit bb264220d9316f6bd7c1fd84b8da398c93912931 upstream.
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).
Cc: <stable@...r.kernel.org>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1462,6 +1462,7 @@ static int amdgpu_dm_backlight_get_brigh
}
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,
};
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