[Bug 90451] [BDW DP 4k] i915: No display with Displayport [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90451

--- Comment #9 from Leho Kraav (:macmaN :lkraav) <leho at kraav.com> ---
(In reply to Eong Chen from comment #6)
> Exactly the same problem with DELL U3415w(3440x1440) and dell e7440 laptop,
> with a dp cable.
> Using linux 4.0.4 with gentoo.
> 
> If need my log, I can post.

Exactly the same hardware set as Eong's above, kernel 4.5.1-gentoo. This
failure to train DP link is not a regular visitor, first I've seen a complete
failure like this during weeks of uptime. Not sure if for example recently
suspending while docked may be throwing some things off.

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