OK, then the regression was introduced by them. FWIW, the reverted commits are: b30edfd8d0b4b22f9c17c208064b39a3d93e6971 drm/i915: Switch to LTTPR non-transparent mode link training 88ebe1f572e284ecfe088648e0ae93803a75a459 drm/i915/dp: Fix LTTPR vswing/pre-emp setting in non-transparent mode Could you open the upstream gitlab Issues and mention those two commits?