kernel 4.4.21 added theese commits:
From a931b4f3726dbb852ce6ec455fcf793ce79b951f Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 17 Dec 2015 09:57:49 -0500
Subject: [PATCH 081/135] drm/amdgpu: fix dp link rate selection (v2)
[ Upstream commit 41869c1c7fe583dec932eb3d87de2e010b30a737 ]
From 4c1aab8bf63b9388398f0115a60c40bbef01181c Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 17 Dec 2015 10:23:34 -0500
Subject: [PATCH 082/135] drm/radeon: fix dp link rate selection (v2)
[ Upstream commit 092c96a8ab9d1bd60ada2ed385cc364ce084180e ]
causing regression in DP detection, reported in Mageia bugzilla for the
radeon part.
https://bugs.mageia.org/show_bug.cgi?id=19707
To fix them up, 4.4 -longterm needs theese fixes:
(already tagged for stable, but didn't apply to 4.4 branch before 4.4.21)
From 02d27234759dc4fe14a880ec1e1dee108cb0b503 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 3 Mar 2016 19:34:28 -0500
Subject: [PATCH] drm/amdgpu/dp: add back special handling for NUTMEG
From c47b9e0944e483309d66c807d650ac8b8ceafb57 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Wed, 11 May 2016 16:21:03 -0400
Subject: [PATCH] drm/amdgpu: fix DP mode validation
From c8213a638f65bf487c10593c216525952cca3690 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 3 Mar 2016 19:26:24 -0500
Subject: [PATCH] drm/radeon/dp: add back special handling for NUTMEG
From ff0bd441bdfbfa09d05fdba9829a0401a46635c1 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Wed, 11 May 2016 16:16:53 -0400
Subject: [PATCH] drm/radeon: fix DP mode validation
They apply cleanly on top of 4.4.30.
--
Thomas
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