[Bug 91407] [SNB] switching monitor off and on breaks DP output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91407

--- Comment #3 from Jani Nikula <jani.nikula at intel.com> ---
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.

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