[Bug 81903] [BDW Bisected MST] no fbcon on DP Hot plug, loss of signal

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81903

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
I guess it is related to:

[  225.976720] [drm:intel_mst_pre_enable_dp] 0
[  225.976821] [drm:intel_dp_check_mst_status] got esi2 02 00 00
[  225.976824] [drm:intel_dp_check_mst_status] got esi 02 00 00
[  225.977932] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[  225.979416] [drm:intel_dp_set_signal_levels] Using signal levels 01000000
[  225.980925] [drm:intel_dp_start_link_train] clock recovery OK
[  225.983522] [drm:intel_dp_complete_link_train] Channel EQ done. DP Training
successful
[  225.983686] [drm:drm_dp_mst_allocate_vcpi] initing vcpi for 619 16
[  225.990866] [drm:drm_dp_dpcd_access] too many retries, giving up
[  225.990869] [drm:drm_dp_dpcd_write_payload] failed to read payload table
status -5
[  225.990923] [drm:intel_mst_enable_dp] 1
[  225.999364] [drm:drm_dp_dpcd_access] too many retries, giving up
[  225.999366] [drm:drm_dp_check_act_status] failed to read payload table
status -5
[  225.999368] [drm:drm_dp_update_payload_part2] payload 0 0
[  226.010408] [drm:intel_hpd_irq_handler] hotplug event received, stat
0x00200000, dig 0x10101011
[  226.010411] [drm:intel_hpd_irq_handler] digital hpd port 1 0
[  226.010420] [drm:intel_dp_hpd_pulse] got hpd irq on port 1 - short
[  226.010692] [drm:intel_dp_check_mst_status] channel EQ not ok, retraining
[  226.011636] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[  226.013135] [drm:intel_dp_set_signal_levels] Using signal levels 01000000
[  226.014614] [drm:intel_dp_start_link_train] clock recovery OK
[  226.017506] [drm:intel_dp_complete_link_train] Channel EQ done. DP Training
successful
[  226.017669] [drm:intel_dp_check_mst_status] got esi 02 00 00


which includes both MST failure and link success. Now to figure what the errors
mean.

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