[Bug 97857] card detects non-existent monitor on display port

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97857

--- Comment #9 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Michel Dänzer from comment #8)
> (In reply to Daniel from comment #7)
> > But I did, in my description: "Since kernel 4.5.0-2 my Xorg.0.log shows that
> > something is also connected to display port...".
> > 
> > Up to 4.5.0-1 everything was fine.
> 
> Oops, sorry, I somehow missed that before. :(
> 
> I think the most likely culprit is
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
> ?id=ff0bd441bdfbfa09d05fdba9829a0401a46635c1
> 

I doubt this is the culprit.  The link training parameters aren't used until a
monitor is already detected.  This wouldn't result in a fake monitor showing
up.

> then, or maybe
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
> ?id=1a738347df2ee4977459a8776fe2c62196bdcb1b

That is a possibility.

> 
> Can you try if reverting either of those fixes the problem?
> 
> Alex, any ideas?

Maybe some core drm/dp change?  Any chance you could bisect?

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