<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#c4">Comment # 4</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:anton@khirnov.net" title="Anton Khirnov <anton@khirnov.net>"> Anton Khirnov</a> <pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=91407#c3">comment #3</a>) > Do I understand correctly that you have the machine hooked up to the same > monitor using both DP and HDMI? > Yes. I added the HDMI connection there just for re-enabling DP because of this problem, otherwise I don't use it since it doesn't support my monitor's full resolution. > 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. Well, before kernel 3.18 my setup worked just fine without any fancy userspace hotplug handlers.</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>