[Bug 88124] i915: regression: after DP connected monitor is turned off, when turned on, it does not work anymore

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88124

--- Comment #19 from Jiri Pirko <jiri at resnulli.us> ---
(In reply to Jiri Pirko from comment #18)
> (In reply to Manasi from comment #17)
> > Thanks for testing with 410-rc6.
> > I tried to reproduce it here at my end with 4.10-rc6 and I can't. But again
> > in my case, the dmesg log says "Sink is not MST capable". But in your case,
> > whats confusing is:
> > 
> > [    2.492671] [drm:intel_dp_read_desc [i915]] DP branch: OUI 90-cc-24
> > dev-ID SYNA HW-rev 1.0 SW-rev 2.17
> > [    2.493030] [drm:intel_dp_detect [i915]] Sink is MST capable
> > 
> > 
> > This means somehow there is a branch device in the patch of laptop's DP and
> > DP on the monitor. Are you using any kind of an adapter? Does your laptop
> > have multiple DP connectors?
> 
> There is a docking station in between. I just ordered
> microdisplayport-display port cable to be able to test this directly.
> 

Okay, I tested with directly connected display. Works fine. So this is only
issue when display is connected through docking station.

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