[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 #4 from Anton Khirnov <anton at khirnov.net> ---
(In reply to Jani Nikula from comment #3)
> 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.

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