[Bug 90963] New: i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90963

            Bug ID: 90963
           Summary: i915:No display with Display port
                    [drm:intel_dp_start_link_train] *ERROR* too many full
                    retries, give up
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: eong.chen at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116468
  --> https://bugs.freedesktop.org/attachment.cgi?id=116468&action=edit
dmesg withe debug enabled, plug in dp after boot.

dmesg - kernel 4.0.5

* Laptop model: DELL E7440
* Linux distribution: Gentoo x86_64
* Graphics: VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 0b)
* Arch: x86_64
* kernel: tested with all 4.0.x kernels, the problem appears in all versions.
* xorg-server: 1.16.3-r1
* xf86-video-intel: 2.99.917
* mesa: 10.4.2
* libdrm: 2.4.59

I use dp to connect to a external DELL U3415w(3440 x 1440 at 60Hz). No matter
how I plug in the dp port, after boot or before boot, the monitor doesn't give
any picture, the monitor says it will turn into power save mode. It used to
work with 3.14 kernels.
And it works with my office's DELL U2713HM(2560x1440).
Tried the same cable and same monitor with a MacBook, everything works.
Tried to merge some fixes in the git but found no solution.

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