<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [HSW] linux next-20170407+ boots to a blank screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=100755#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [HSW] linux next-20170407+ boots to a blank screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=100755">bug 100755</a> from <a class="email" href="mailto:dhinakaran.pandiyan@intel.com" title="Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>"> Dhinakaran Pandiyan</a> <pre>The link m_n and data m_n values are different before and after suspend/resume. My hunch is when you booted with fastboot=1, commit[1] did not reduce data m_n but did so after suspend/resume. Before: [drm:intel_dump_pipe_config] dp m_n: lanes: 2; gmch_m: 2428257, gmch_n: 8388608, link_m: 134903, link_n: 524288, tu: 64 After: [drm:intel_dump_pipe_config] dp m_n: lanes: 2; gmch_m: 302776, gmch_n: 1048576, link_m: 33641, link_n: 131072, tu: 64 Try reverting this - commit 9a86cda07af2c63649932f0a4fc757701ef54c42 Author: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>> Date: Mon Mar 27 14:33:25 2017 +0300 drm/i915/dp: reduce link M/N parameters Several major vendor USB-C->HDMI converters, in particular the DA200, fail to recover a 5.4 GHz 1 lane signal if the link N is greater than 0x80000.</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>