<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Screen is frozen on second connection of DP MST dock" href="https://bugs.freedesktop.org/show_bug.cgi?id=107546#c36">Comment # 36</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Screen is frozen on second connection of DP MST dock" href="https://bugs.freedesktop.org/show_bug.cgi?id=107546">bug 107546</a> from <a class="email" href="mailto:1vf+freedesktop@posteo.net" title="Vedran Furač <1vf+freedesktop@posteo.net>"> Vedran Furač</a> <pre>Hello, An update, seems that even with 4.10 it doesn't work perfectly on NUC. After switching input back to DP input for the 3rd or 4th time, nothing happened, display showed "no signal" error. However, X remained fully functional and after disconnecting the cable and reconnecting it, both displays were detected and worked fine afterwards. I have similar problem on Thinkpad X1 carbon 5th gen (4.18 kernel). Initially it works fine, but upon disconnecting displays (TB/DP) there's this error: [30373.030578] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training [30373.298845] [drm:intel_encoders_pre_enable.isra.103 [i915]] *ERROR* failed to allocate vcpi and after connecting them again: [33022.853059] [drm:intel_dp_start_link_train [i915]] *ERROR* Timed out waiting for DP idle patterns [33022.861393] [drm:intel_ddi_prepare_link_retrain [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit ... [33057.741347] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to get link status and obviously no signal on displays. Luckily there is no locking on Thinkpad like on NUC and X still works fine, but I have to reboot to get external displays working again. I'll try to get debug output from Thinkpad tomorrow. Regards, Vedran</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>