<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [CI] igt@kms_* fail - igt-kms-WARNING: connector 76/eDP-1 has no modes" href="https://bugs.freedesktop.org/show_bug.cgi?id=103369#c49">Comment # 49</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [CI] igt@kms_* fail - igt-kms-WARNING: connector 76/eDP-1 has no modes" href="https://bugs.freedesktop.org/show_bug.cgi?id=103369">bug 103369</a> from <a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> Imre Deak</a> <pre>Looks like the modes on eDP are pruned due to too high mode clock. That in turn is caused by a previous link training failure: <7>[ 2153.428268] [drm:intel_dp_dump_link_status [i915]] ln0_1:0x11 ln2_3:0x11 align:0x80 sink:0x0 adj_req0_1:0x77 adj_req2_3:0x77 <7>[ 2153.428303] [drm:intel_dp_start_link_train [i915]] Channel equalization failed 5 times <7>[ 2153.428341] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:76:eDP-1] Link Training failed at link rate = 270000, lane count = 4 which sets the ports maximum link rate to 162000 and afterwards causes failed modesets: <7>[ 2153.723132] [drm:drm_mode_debug_printmodeline] Modeline 80:"3200x1800" 60 361310 3200 3248 3280 3316 1800 1802 1807 1816 0x48 0xa <7>[ 2153.723247] [drm:intel_dp_compute_config [i915]] DP link computation with max lane count 4 max bw 162000 pixel clock 361310KHz <7>[ 2153.723355] [drm:intel_atomic_check [i915]] Encoder config failure <7>[ 2153.723465] [drm:intel_dump_pipe_config [i915]] [CRTC:42:pipe A][failed] and pruned modes: <7>[ 2154.575833] [drm:drm_mode_prune_invalid] Not using 3200x1800 mode: CLOCK_HIGH One question is why link training fails, but also if we should reset the link rate limitation sometime afterwards. Currently for eDP it'd only happen during system resume or reloading the driver, since eDP ignores long HPDs where the link rate limit is reset atm.</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> </ul> </body> </html>