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    Subject[PATCH 4.19 211/211] drm/amd/display: Restore backlight brightness after system resume
    Date
    From: Kai-Heng Feng <kai.heng.feng@canonical.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@vger.kernel.org>
    Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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