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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #32 from Tim Small <tim at buttersideup.com> ---
Recurrance with:
Linux ermintrude 4.17.0-rc6-drm-tip+ #27 SMP Tue May 22 08:54:13 UTC 2018
x86_64 GNU/Linux

Second monitor continues to intermittently flash until after next reboot.

[1848106.948820] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat
0x00400000, dig 0x10101110, pins 0x00000040
[1848106.948850] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
[1848106.948897] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
[1848106.949295] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 40
02 02 06 00 00 00 00
[1848106.950130] [drm:i915_hotplug_work_func [i915]] running encoder hotplug
functions
[1848106.950148] [drm:i915_hotplug_work_func [i915]] Connector DP-1 (pin 6)
received hotplug event.
[1848106.950177] [drm:intel_dp_detect [i915]] [CONNECTOR:78:DP-1]
[1848106.950573] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 40
02 02 06 00 00 00 00
[1848106.950847] [drm:intel_dp_print_rates [i915]] source rates: 162000,
216000, 270000, 324000, 432000, 540000
[1848106.950862] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000,
540000
[1848106.950877] [drm:intel_dp_print_rates [i915]] common rates: 162000,
270000, 540000
[1848106.951235] [drm:drm_dp_read_desc [drm_kms_helper]] DP sink: OUI 00-00-00
dev-ID  HW-rev 0.0 SW-rev 0.0 quirks 0x0000
[1848106.951512] [drm:intel_dp_detect [i915]] Sink is not MST capable
[1848106.957250] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio
support
[1848106.958426] [drm:intel_dp_start_link_train [i915]] Using LINK_BW_SET value
14
[1848106.958716] [drm:intel_dp_set_signal_levels [i915]] Using signal levels
00000000
[1848106.958731] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
[1848106.958746] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis
level 0
[1848106.958761] [drm:intel_dp_program_link_training_pattern [i915]] Using DP
training pattern TPS1
[1848106.959337] [drm:intel_dp_set_signal_levels [i915]] Using signal levels
04000000
[1848106.959351] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 1
[1848106.959365] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis
level 0
[1848106.959931] [drm:intel_dp_set_signal_levels [i915]] Using signal levels
07000000
[1848106.959945] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[1848106.959959] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis
level 0
[1848106.960540] [drm:intel_dp_start_link_train [i915]] clock recovery OK
[1848106.960554] [drm:intel_dp_program_link_training_pattern [i915]] Using DP
training pattern TPS3
[1848106.961427] [drm:intel_dp_set_signal_levels [i915]] Using signal levels
08000000
[1848106.961455] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[1848106.961469] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis
level 1
[1848106.962334] [drm:intel_dp_set_signal_levels [i915]] Using signal levels
08000000
[1848106.962361] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[1848106.962375] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis
level 1
[1848106.963240] [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP
Training successful
[1848106.963404] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:78:DP-1]
Link Training Passed at Link Rate = 540000, Lane count = 4
[1848106.972959] [drm:i915_hotplug_work_func [i915]] Connector HDMI-A-2 (pin 6)
received hotplug event.
[1848106.972977] [drm:intel_hdmi_detect [i915]] [CONNECTOR:83:HDMI-A-2]
[1848106.973212] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for
addr: 0050 w(1)
[1848106.973227] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first
message, retry
[1848106.973472] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for
addr: 0050 w(1)
[1848106.973494] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent
adapter i915 gmbus dpc
[1848106.973509] [drm:intel_hdmi_set_edid [i915]] HDMI GMBUS EDID read failed,
retry using GPIO bit-banging
[1848106.973524] [drm:intel_gmbus_force_bit [i915]] enabling bit-banging on
i915 gmbus dpc. force bit now 1
[1848106.976198] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent
adapter i915 gmbus dpc
[1848106.976213] [drm:intel_gmbus_force_bit [i915]] disabling bit-banging on
i915 gmbus dpc. force bit now 0
[1848106.976470] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for
addr: 0040 w(1)
[1848106.976497] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first
message, retry
[1848106.976834] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for
addr: 0040 w(1)
[1848106.976863] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode
HDMI ID:  (err -6)
[1848106.989637] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun

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