[Bug 99322] [SKL] Flashing black screen with dual monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99322

--- Comment #3 from Tim Small <tim at buttersideup.com> ---
Just running with the other monitor for the time being (Dell switched off, AOC
U2879VF switched on).

The AOC just went blank three times, for about 2 seconds at a time, with about
2 seconds between each blank.

This occurred about 1.5 minutes after the following kernel messages.  Nothing
happened which should have caused a hotplug event AFAIK, and I didn't notice
any display disturbance at 09:27:35.

Jan  9 09:27:35 ermintrude kernel: [144836.324366] [drm:intel_get_hpd_pins
[i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins
0x00000040
Jan  9 09:27:35 ermintrude kernel: [144836.324380] [drm:intel_hpd_irq_handler
[i915]] digital hpd port C - short
Jan  9 09:27:35 ermintrude kernel: [144836.324398] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port C - short
Jan  9 09:27:35 ermintrude kernel: [144836.324796] [drm:intel_dp_read_dpcd
[i915]] DPCD: 12 14 c4 01 01 00 01 00 02 02 06 00 00 00 00
Jan  9 09:27:35 ermintrude kernel: [144836.325619]
[drm:intel_dp_check_link_status [i915]] DDI C: channel EQ not ok, retraining
Jan  9 09:27:35 ermintrude kernel: [144836.326502]
[drm:intel_dp_set_signal_levels [i915]] Using signal levels 00000000
Jan  9 09:27:35 ermintrude kernel: [144836.326512]
[drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
Jan  9 09:27:35 ermintrude kernel: [144836.326521]
[drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  9 09:27:35 ermintrude kernel: [144836.326531]
[drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern
TPS1
Jan  9 09:27:35 ermintrude kernel: [144836.327099]
[drm:intel_dp_set_signal_levels [i915]] Using signal levels 04000000
Jan  9 09:27:35 ermintrude kernel: [144836.327109]
[drm:intel_dp_set_signal_levels [i915]] Using vswing level 1
Jan  9 09:27:35 ermintrude kernel: [144836.327118]
[drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  9 09:27:35 ermintrude kernel: [144836.327678]
[drm:intel_dp_set_signal_levels [i915]] Using signal levels 07000000
Jan  9 09:27:35 ermintrude kernel: [144836.327687]
[drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  9 09:27:35 ermintrude kernel: [144836.327696]
[drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  9 09:27:35 ermintrude kernel: [144836.328257]
[drm:intel_dp_start_link_train [i915]] clock recovery OK
Jan  9 09:27:35 ermintrude kernel: [144836.328266]
[drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern
TPS3
Jan  9 09:27:35 ermintrude kernel: [144836.329133]
[drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
Jan  9 09:27:35 ermintrude kernel: [144836.329142]
[drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  9 09:27:35 ermintrude kernel: [144836.329151]
[drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
Jan  9 09:27:35 ermintrude kernel: [144836.330007]
[drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
Jan  9 09:27:35 ermintrude kernel: [144836.330016]
[drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  9 09:27:35 ermintrude kernel: [144836.330025]
[drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
Jan  9 09:27:35 ermintrude kernel: [144836.330882]
[drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
Jan  9 09:27:35 ermintrude kernel: [144836.355682]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

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