<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - eDP link clock recovery fails with *ERROR* too many full retries, give up" href="https://bugs.freedesktop.org/show_bug.cgi?id=92878#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - eDP link clock recovery fails with *ERROR* too many full retries, give up" href="https://bugs.freedesktop.org/show_bug.cgi?id=92878">bug 92878</a> from <a class="email" href="mailto:conselvan2@gmail.com" title="Ander Conselvan de Oliveira <conselvan2@gmail.com>"> Ander Conselvan de Oliveira</a> <pre>(In reply to Ander Conselvan de Oliveira from <a href="show_bug.cgi?id=92878#c12">comment #12</a>) > This could be related to an issue Sivakumar once mentioned, that the driver > handles the request from the sink wrong, using the maximum supported > pre-emphasis for the requested voltage swing, instead of using the requested > pre-emphasis with the maximum support vswing. [ 204.649626] [drm:intel_dp_set_signal_levels] Using signal levels 00000000 [ 204.649627] [drm:intel_dp_set_signal_levels] Using vswing level 0 [ 204.649628] [drm:intel_dp_set_signal_levels] Using pre-emphasis level 0 [ 204.650229] [drm:intel_dp_link_training_clock_recovery] link status: 00 00 80 00 66 66 [ 204.650230] [drm:intel_dp_set_signal_levels] Using signal levels 08000000 [ 204.650231] [drm:intel_dp_set_signal_levels] Using vswing level 2 [ 204.650231] [drm:intel_dp_set_signal_levels] Using pre-emphasis level 1 [ 204.650813] [drm:intel_dp_link_training_clock_recovery] link status: 00 00 00 00 66 66 Unfortunately that's not the issue. The sink really does request vswing 2 and pre emphasis 1. One interesting thing is in the first try the LINK_STATUS_UPDATED bit is set. It is clear in all other attempts. I wonder if the device expects us to iterate at max voltage. Another possibility is that the hardware is just not programmed correctly, so the signal the sink expects is not going through the link. That would help explain <a class="bz_bug_link bz_status_NEW " title="NEW - Laptop black screen [drm:intel_dp_start_link_train [i915]] *ERROR* failed to train DP, aborting" href="show_bug.cgi?id=93517">bug 93517</a> too.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>