[Bug 73539] New: [Haswell] eDP panel shows blank screen when starting X server

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73539

          Priority: medium
            Bug ID: 73539
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Haswell] eDP panel shows blank screen when starting X
                    server
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: steve at steveit.co.uk
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 91929
  --> https://bugs.freedesktop.org/attachment.cgi?id=91929&action=edit
dmesg output

Tested on Dell Venue 11 Pro tablet (Haswell i5 4210Y, Intel HD4200).

Tested this with the following distros, all with various versions of Xorg and
Linux Kernel.

Ubuntu 14.04 (daily iso build, up to latest)
Ubuntu 13.04
Ubuntu 12.04.3
Fedora 20 daily build
Debian Wheezy
Arch Linux daily build

With "nomodeset", I get varying levels of success when booting from legacy
mode. when booting with UEFI, I've had no such luck.

The only common error I've found across many of the distros is the following
error: 

[drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
[drm:intel_dp_start_link_train], too many full retries, give up

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