[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90340

--- Comment #3 from Alex Deucher <alexdeucher at gmail.com> ---
Does forcing a dpms cycle also work?  E.g.,
sleep 5; xset dpms force off

Does turning the monitor off work with other drivers or OSes?  DP requires link
training to bring the link up between the monitor and the GPU.  I suspect when
you physically turn off/on the monitor, it does not generate a hotplug signal
so the driver had no way of knowing that the link needs to be re-established.

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