<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend" href="https://bugs.freedesktop.org/show_bug.cgi?id=89589#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend" href="https://bugs.freedesktop.org/show_bug.cgi?id=89589">bug 89589</a> from <a class="email" href="mailto:consume.noise@gmail.com" title="Daniel Martin <consume.noise@gmail.com>"> Daniel Martin</a> <pre>Bisected down to: commit e7d6f7d708290da1b7c92f533444b042c79412e0 Author: Dave Airlie <<a href="mailto:airlied@redhat.com">airlied@redhat.com</a>> Date: Mon Dec 8 13:23:37 2014 +1000 drm/i915: resume MST after reading back hw state Otherwise the MST resume paths can hit DPMS paths which hit state checker paths, which hit WARN_ON, because the state checker is inconsistent with the hw. This fixes a bunch of WARN_ON's on resume after undocking. ... Reverting this commit fixes the problem, but brings the warnings back. :/</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> <li>You are the assignee for the bug.</li> </ul> </body> </html>