few tests - dmesg-warn/abort - *ERROR* Sending link address failed with -5
<7> [47.984800] i915 0000:00:02.0: [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX USBC2/DDI TC2/PHY TC2: Base DPCD: 12 14 c4 81 01 11 01 83 2a 3f 04 00 00 00 84
<7> [47.984810] i915 0000:00:02.0: [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX USBC2/DDI TC2/PHY TC2: DPCD: 14 1e c4 81 01 11 01 83 2a 3f 04 00 00 00 84
<7> [47.986207] i915 0000:00:02.0: [drm:intel_dp_init_lttpr_and_dprx_caps [i915]] [CONNECTOR:277:DP-3][ENCODER:276:DDI TC2/PHY TC2][DPRX] LTTPR common capabilities: 20 1e 80 aa 04 00 01 03
<7> [47.988440] i915 0000:00:02.0: [drm:intel_dp_init_lttpr_and_dprx_caps [i915]] [CONNECTOR:277:DP-3][ENCODER:276:DDI TC2/PHY TC2][LTTPR 1] PHY capabilities: 04 03 00
<7> [47.989959] i915 0000:00:02.0: [drm:drm_dp_dump_desc.isra.0 [drm_display_helper]] AUX USBC2/DDI TC2/PHY TC2: LTTPR 1: OUI 98-4f-ee dev-ID GBR HW-rev 10.0 SW-rev 2.14 quirks 0x0000
<7> [47.993198] i915 0000:00:02.0: [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX USBC2/DDI TC2/PHY TC2: Base DPCD: 12 14 c4 81 01 11 01 83 2a 3f 04 00 00 00 84
<7> [47.993214] i915 0000:00:02.0: [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX USBC2/DDI TC2/PHY TC2: DPCD: 14 1e c4 81 01 11 01 83 2a 3f 04 00 00 00 84
<7> [47.994734] i915 0000:00:02.0: [drm:drm_dp_dump_desc.isra.0 [drm_display_helper]] AUX USBC2/DDI TC2/PHY TC2: DP branch: OUI 90-cc-24 dev-ID SYNAR" HW-rev 1.0 SW-rev 5.4 quirks 0x0028
<7> [47.998381] i915 0000:00:02.0: [drm:drm_dp_read_downstream_info [drm_display_helper]] AUX USBC2/DDI TC2/PHY TC2: DPCD DFP: 08 00 00 00 08 00 00 00 00 00 00 00
<7> [48.031793] i915 0000:00:02.0: [drm:drm_dp_mst_wait_tx_reply.isra.0 [drm_display_helper]] timedout msg send ffff888114d89c00 2 0
<3> [48.031875] i915 0000:00:02.0: [drm] *ERROR* Sending link address failed with -5
<7> [48.032253] i915 0000:00:02.0: [drm:drm_dp_mst_topology_put_mstb [drm_display_helper]] mstb ffff888107b44100 (0)
<7> [48.032301] i915 0000:00:02.0: [drm:drm_dp_delayed_destroy_work [drm_display_helper]] mstb ffff888107b44100 (0)
<7> [48.049479] [drm:i915_gem_do_execbuffer [i915]] EINVAL at eb_validate_vma:509
<7> [48.051948] i915 0000:00:02.0: [drm:error_state_write [i915]] Resetting error state
<6> [48.052269] [IGT] gem_busy: exiting, ret=0
<7> [48.052415] i915 0000:00:02.0: [drm:i915_drop_caches_set [i915]] Dropping caches: 0x000001dc [0x000001dc]
<7> [48.104840] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling AUX_TC2
<7> [49.020826] i915 0000:00:02.0: [drm:intel_tc_port_update_mode [i915]] Port E/TC#2: TC port mode reset (dp-alt -> disconnected)
<7> [49.021775] i915 0000:00:02.0: [drm:intel_pps_vdd_off_sync_unlocked [i915]] [ENCODER:240:DDI A/PHY A] PPS 0 turning VDD off
<7> [49.022287] i915 0000:00:02.0: [drm:intel_pps_vdd_off_sync_unlocked [i915]] [ENCODER:240:DDI A/PHY A] PPS 0 PP_STATUS: 0x80000008 PP_CONTROL: 0x00000067
<7> [49.022560] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling DC_off
<7> [49.023074] i915 0000:00:02.0: [drm:skl_enable_dc6 [i915]] Enabling DC6
<7> [49.023369] i915 0000:00:02.0: [drm:gen9_set_dc_state.part.0 [i915]] Setting DC state from 00 to 02
<7> [49.086669] i915 0000:00:02.0: [drm:intel_power_well_enable [i915]] enabling DC_off