tree 8e9c52ec7d38d36e38d4572414ff5be9df1b24d8
parent 4d8bdf7f3a869e076aa8496a8ed95b81bbca54ee
author Kai-Heng Feng <kai.heng.feng@canonical.com> 1567413222 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1570273813 +0200

drm/amd/display: Restore backlight brightness after system resume

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>