igt@core_hotunplug@* - dmesg-warn - Failed to read FEC DPCD register
<7> [93.897095] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [93.955726] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [93.957501] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [94.011621] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [94.013367] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [94.071702] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [94.073453] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [94.131691] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [94.133440] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [94.187709] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [94.189381] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [94.247713] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [94.249385] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [94.307603] xe 0000:03:00.0: [drm:drm_dp_mst_wait_tx_reply.isra.0 [drm_display_helper]] timedout msg send ffff888112489c00 2 0
<7> [94.307767] xe 0000:03:00.0: [drm:drm_dp_mst_topology_put_mstb [drm_display_helper]] mstb ffff888117f723f0 (2)
<3> [94.307824] (NULL device *): [drm] *ERROR* Failed to read FEC DPCD register
<7> [94.313247] [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX B/DDI B/PHY B: Base DPCD: 12 0a c4 01 01 01 01 81 02 00 06 00 00 00 80
<7> [94.313314] [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX B/DDI B/PHY B: DPCD: 14 0a c4 01 01 01 01 81 02 00 06 00 00 00 80
<7> [94.314950] [drm:drm_dp_read_desc [drm_display_helper]] AUX B/DDI B/PHY B: DP branch: OUI 00-e0-4c dev-ID Dp1.2 HW-rev 0.0 SW-rev 0.0 quirks 0x0000
<7> [94.315116] xe 0000:03:00.0: [drm:drm_dp_mst_topology_try_get_mstb [drm_display_helper]] mstb ffff888117f723f0 (3)
<7> [94.325230] xe 0000:03:00.0: [drm:intel_get_hpd_pins [xe]] hotplug event received, stat 0x00020000, dig 0x00008898, pins 0x00000020, long 0x00000000
<7> [94.325659] xe 0000:03:00.0: [drm:intel_hpd_irq_handler [xe]] digital hpd on [ENCODER:253:DDI B/PHY B] - short
<7> [94.326130] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [94.327919] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 10 00 00
<7> [94.329605] xe 0000:03:00.0: [drm:drm_dp_mst_topology_try_get_mstb [drm_display_helper]] mstb ffff888117f723f0 (4)
<7> [94.329679] xe 0000:03:00.0: [drm:drm_dp_mst_topology_put_mstb [drm_display_helper]] mstb ffff888117f723f0 (3)
<7> [94.329856] xe 0000:03:00.0: [drm:drm_dp_mst_topology_put_mstb [drm_display_helper]] mstb ffff888117f723f0 (2)
<7> [94.329980] xe 0000:03:00.0: [drm:drm_dp_mst_topology_try_get_mstb [drm_display_helper]] mstb ffff888117f723f0 (3)
<7> [94.332739] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 00 00 00
<7> [94.339692] xe 0000:03:00.0: [drm:intel_get_hpd_pins [xe]] hotplug event received, stat 0x00020000, dig 0x00008898, pins 0x00000020, long 0x00000000
<7> [94.340099] xe 0000:03:00.0: [drm:intel_hpd_irq_handler [xe]] digital hpd on [ENCODER:253:DDI B/PHY B] - short
<7> [94.340554] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:253:DDI B/PHY B] - short
<7> [94.342281] xe 0000:03:00.0: [drm:intel_dp_hpd_pulse [xe]] DPRX ESI: 41 10 00 00