<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Unable to detect monitor modes connected to a TB16 Dell dock" href="https://bugs.freedesktop.org/show_bug.cgi?id=111507#c31">Comment # 31</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Unable to detect monitor modes connected to a TB16 Dell dock" href="https://bugs.freedesktop.org/show_bug.cgi?id=111507">bug 111507</a> from <a class="email" href="mailto:stanislav.lisovskiy@intel.com" title="Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>"> Stanislav Lisovskiy</a> <pre>I think I have found something interesting. For DP-1 connector ocassionally despite received hotplug event intel_dp_detect function seems to exit prematurely. Like normally it should look like this: [ 1244.458373] [drm:intel_dp_detect [i915]] [CONNECTOR:100:DP-1] [ 1244.459728] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 00 00 05 01 83 02 00 00 00 00 00 02 [ 1244.461024] [drm:drm_dp_read_desc [drm_kms_helper]] DP branch: OUI 90-cc-24 dev-ID SYNA30 HW-rev 1.0 SW-rev 3.10 quirks 0x0000 [ 1244.463838] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000 [ 1244.463858] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000, 540000 [ 1244.463875] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000 [ 1244.465111] [drm:intel_dp_detect [i915]] MST support? port C: yes, sink: yes, modparam: yes However in the log "dmesg with drm.debug=0x1e when plugging the dock usb type-c cable a single time" the last hotplug event for DP-1 looks like this: [ 1245.482006] [drm:i915_hotplug_work_func [i915]] Connector DP-1 (pin 5) received hotplug event. [ 1245.482093] [drm:intel_dp_detect [i915]] [CONNECTOR:92:DP-1] So not even showing sink rates means that it was determined as disconnected and intel_dp_read_dpcd probably failed. However this port was already disconnected before in the log: [ 1244.181015] [drm:i915_hotplug_work_func [i915]] running encoder hotplug functions [ 1244.181148] [drm:i915_hotplug_work_func [i915]] Connector DP-1 (pin 5) received hotplug event. [ 1244.181272] [drm:intel_dp_detect [i915]] [CONNECTOR:92:DP-1] [ 1244.181769] [drm:intel_dp_detect [i915]] MST device may have disappeared 1 vs 1 [ 1244.181983] [drm:intel_power_well_enable [i915]] enabling DC off [ 1244.182402] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00 [ 1244.182951] [drm:intel_power_well_enable [i915]] enabling power well 2 [ 1244.191512] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status 0x7d4003ff ... [ 1244.445543] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status 0x7d4003ff [ 1244.454008] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status 0x7d4003ff [ 1244.454017] [drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries, giving up. First error: -110 Which makes this all look a little suspicious.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>