The xorg log looks like everything is fine. The kernel i915 driver shows on resume: [ 312.487879] [drm:intel_mst_pre_enable_dp [i915]] *ERROR* failed to allocate vcpi which may be related to the problem... BTW, this is DELL Latitude E7250 laptop. The problem started happening after updating from Leap 15.0 to Leap 15.2.