igt@i915_module_load@load - dmesg-warn - *ERROR* Failed to read DPCD register *

https://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1884715467?query_key=c821d82a6c7c82f36a77239d6e5bc5b7f466d41e

<7> [47.653256] i915 0000:00:02.0: [drm:update_display_info] [CONNECTOR:278:DP-3] Assigning EDID-1.4 digital sink color depth as 10 bpc.
<7> [47.653260] i915 0000:00:02.0: [drm:update_display_info] [CONNECTOR:278:DP-3] ELD monitor LG HDR 4K
<7> [47.653263] i915 0000:00:02.0: [drm:update_display_info] [CONNECTOR:278:DP-3] ELD size 32, SAD count 1
<7> [47.653277] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] [CONNECTOR:278:DP-3] VRR capable: yes
<7> [47.653409] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] [CONNECTOR:278:DP-3] DFP max bpc 0, max dotclock 0, TMDS clock 0-0, PCON Max FRL BW 0Gbps
<7> [47.675422] i915 0000:00:02.0: [drm:drm_dp_dpcd_access [drm_display_helper]] AUX USBC3/DDI TC3/PHY TC3: Too many retries, giving up. First error: -6
<7> [47.700967] i915 0000:00:02.0: [drm:drm_dp_dpcd_access [drm_display_helper]] AUX USBC3/DDI TC3/PHY TC3: Too many retries, giving up. First error: -6
<3> [47.700992] i915 0000:00:02.0: [drm] *ERROR* Failed to read DPCD register 0x92
<7> [47.700996] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] PCON ENCODER DSC DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00
<7> [47.701315] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] [CONNECTOR:278:DP-3] RGB->YcbCr conversion? no, YCbCr 4:2:0 allowed? yes, YCbCr 4:4:4->4:2:0 conversion? no
<7> [47.720277] i915 0000:00:02.0: [drm:intel_tc_port_update_mode [i915]] Port D/TC#1: TC port mode reset (tbt-alt -> disconnected)
<7> [47.732457] i915 0000:00:02.0: [drm:drm_dp_dpcd_access [drm_display_helper]] AUX USBC3/DDI TC3/PHY TC3: Too many retries, giving up. First error: -6
<7> [47.733243] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:278:DP-3] probed modes:
<7> [47.733269] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "3840x2160": 60 533250 3840 3888 3920 4000 2160 2214 2219 2222 0x48 0x9
<7> [47.733280] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "3840x2160": 30 266640 3840 3848 3992 4000 2160 2214 2219 2222 0x40 0x9
<7> [47.733288] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "2560x1440": 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x9
<7> [47.733295] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1920x1080": 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
<7> [47.733301] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1920x1080": 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
<7> [47.733308] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1920x1080": 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
<7> [47.733314] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1600x900": 60 108000 1600 1624 1704 1800 900 901 904 1000 0x40 0x5
<7> [47.733321] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1280x1024": 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
<7> [47.733327] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1280x800": 60 83500 1280 1352 1480 1680 800 803 809 831 0x40 0x6
<7> [47.733334] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1152x864": 60 81768 1152 1216 1336 1520 864 867 871 897 0x0 0x6
<7> [47.733341] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1280x720": 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
<7> [47.733347] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] Probed mode: "1280x720": 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5