<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [SNB] switching monitor off and on breaks DP output" href="https://bugs.freedesktop.org/show_bug.cgi?id=91407#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [SNB] switching monitor off and on breaks DP output" href="https://bugs.freedesktop.org/show_bug.cgi?id=91407">bug 91407</a> from <a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> Jani Nikula</a> <pre>Do I understand correctly that you have the machine hooked up to the same monitor using both DP and HDMI? The symptoms do sound like your userspace is not fancy enough to handle the hotplug uevents. What to do on hotplug (or hot-unplug, or switching the sink on/off) is a userspace policy decision. I'm guessing the driver keeps transmitting the signal even after you've switched off the display, your userspace does nothing, and when you switch the display back on, HDMI has a fighting chance to recover, however the DP link doesn't recover like that.</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>