[Intel-gfx] DisplayPort connectors no longer working (regression?)

[Oskar Berggren]

Hi,

As detailed in another mail, my Skylake system freeze when connecting a
secondary monitor using DisplayPort (first monitor was HDMI) with Fedora
kernel 4.4.6. Now with current drm-intel-nightly it doesn't freeze when I
connect the DP monitor but there is in fact no visible reaction at all -
the DP-monitor remains black and xrandr shows all DP connectors as
disconnected.

With drm.debug=0x1e, there is in fact some reaction in the kernel log when
the DP-monitor is connected, but it remains offline. This is the full set
of logs generated when the DP-cable is inserted:

Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_hdmi_detect] Live status not up!
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_get_hpd_pins] hotplug event
received, stat 0x00800000, dig 0x10121010, pins 0x00000080
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_hpd_irq_handler] digital hpd
port D - long
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_hpd_irq_storm_detect] Received
HPD interrupt on PIN 7 - cnt: 0
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_hpd_pulse] got hpd irq on
port D - long
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_get_dpcd] DPCD: 12 14 c4 01
01 01 01 81 02 00 06 00 00 00 00
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_get_dpcd] Display Port TPS3
support: source yes, sink yes
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_print_rates] source rates:
162000, 216000, 270000, 324000, 432000, 540000
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_print_rates] sink rates:
162000, 270000, 540000
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_print_rates] common rates:
162000, 270000, 540000
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_probe_oui] Sink OUI: 00e04c
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_probe_oui] Branch OUI: 00e04c
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_probe_mst] Sink is MST capable
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_long_pulse] MST device may
have disappeared 1 vs 1
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_dpcd_access] too many retries,
giving up
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_dpcd_access] too many retries,
giving up
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_dpcd_access] too many retries,
giving up
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_dpcd_access] too many retries,
giving up
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_dpcd_access] too many retries,
giving up
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_dpcd_access] too many retries,
giving up
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_send_sideband_msg] failed to
dpcd write 5 -5
Apr 02 20:09:04 UNKNOWN kernel: [drm:process_single_tx_qlock] sideband msg
failed to send
Apr 02 20:09:04 UNKNOWN kernel: [drm:process_single_down_tx_qlock] failed
to send msg in q -5
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_dp_send_link_address] link address
failed -5
Apr 02 20:09:04 UNKNOWN kernel: [drm:i915_hotplug_work_func] running
encoder hotplug functions
Apr 02 20:09:04 UNKNOWN kernel: [drm:i915_hotplug_work_func] Connector DP-2
(pin 7) received hotplug event.
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_detect] [CONNECTOR:48:DP-2]
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_get_dpcd] DPCD: 12 14 c4 01
01 01 01 81 02 00 06 00 00 00 00
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_get_dpcd] Display Port TPS3
support: source yes, sink yes
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_print_rates] source rates:
162000, 216000, 270000, 324000, 432000, 540000
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_print_rates] sink rates:
162000, 270000, 540000
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_print_rates] common rates:
162000, 270000, 540000
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_probe_oui] Sink OUI: 00e04c
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_probe_oui] Branch OUI: 00e04c
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_probe_mst] Sink is MST capable
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_dp_long_pulse] MST device may
have disappeared 1 vs 1
Apr 02 20:09:04 UNKNOWN kernel: [drm:i915_hotplug_work_func] Connector
HDMI-A-3 (pin 7) received hotplug event.
Apr 02 20:09:04 UNKNOWN kernel: [drm:intel_hdmi_detect]
[CONNECTOR:52:HDMI-A-3]
Apr 02 20:09:04 UNKNOWN kernel: [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpd]
NAK for addr: 0050 w(1)
Apr 02 20:09:04 UNKNOWN kernel: [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpd]
NAK on first message, retry
Apr 02 20:09:04 UNKNOWN kernel: [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpd]
NAK for addr: 0050 w(1)
Apr 02 20:09:04 UNKNOWN kernel: [drm:drm_do_probe_ddc_edid] drm: skipping
non-existent adapter i915 gmbus dpd


/Oskar
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