[Bug 100765] [DP] [SKL] DPMS: monitor turns on and off instead of suspending with DisplayPort

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100765

Kenneth Heafield <freedesktop at kheafield.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #5 from Kenneth Heafield <freedesktop at kheafield.com> ---
Experiment 1. Send the monitor in to Samsung for repair.  Result: came back
with longer pauses between turning on and off but still has the same
fundamental problem.  

Experiment 2. Connect returned monitor to Dell XPS 113 9360 (Kaby Lake) via
type-C to DisplayPort.  Result: works correctly.  

Experiment 3. Vanilla 4.14.13 from kernel.org with Gigabyte Z170X-Gaming G7
revision 1.0.  Still has the alternating issue when connected to DisplayPort
from the motherboard or a type-C to DisplayPort adapter.  

Experiment 4. Buy a type-C to HDMI 2.0 cable and connect it to the monitor's
HDMI input.  Power management works.  xrandr identifies the monitor as DP-2.  

So in the end DPMS via DisplayPort is still broken with this Samsung monitor. 
But I have a configuration that works (type-C to HDMI cable).  

I suspect my Gigabyte Z170X-Gaming 7 rev 1.0 motherboard is slightly broken. 
Additional evidence from this is that the HDMI output directly from the
motherboard blanks on random occasions.  Which is why I started trying to use
DisplayPort in the first place.

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