DisplayPort connectors no longer working (regression?)

Oskar Berggren <oskar.berggren@xxxxxxxxx> · Sat, 2 Apr 2016 20:55:06 +0100

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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