[Bug 105470] New: [BISECTED] Failure to boot docked with laptop lid closed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105470

            Bug ID: 105470
           Summary: [BISECTED] Failure to boot docked with laptop lid
                    closed
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: labbott at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 138048
  --> https://bugs.freedesktop.org/attachment.cgi?id=138048&action=edit
git bisect log

Fedora has gotten several reports of 100% failure to boot while docked (see
https://bugzilla.redhat.com/show_bug.cgi?id=1549042 for example) as a
regression between kernel versions 4.14 and 4.15. I bisected and came up with 

commit 5ea2355a100a3c6304901d058aee06d3a6be69bc (refs/bisect/bad)
Author: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Date:   Tue Oct 3 17:22:11 2017 +0300

    drm/i915/mst: Use MST sideband message transactions for dpms control

    Use the POWER_DOWN_PHY and POWER_UP_PHY sideband message transactions to
    set power states for downstream sinks. Apart from giving us the ability
    to set power state for individual sinks, this fixes the below test for
    me.

    $ xrandr --display :0 --output DP-2-2-8 --off
    $ xrandr --display :0 --output DP-2-2-1 --off
    $ xrandr --display :0 --output DP-2-2-8 --auto #Black screen
    $ xrandr --display :0 --output DP-2-2-1 --auto

    v2: Modify and document the dpms and port disable order (Ville)
        Add comment explaining is_mst = !crtc_state equivalence(Ville, Maarten)

    v3 by Jani: rebase

    References: https://bugs.freedesktop.org/show_bug.cgi?id=90963
    References: https://bugs.freedesktop.org/show_bug.cgi?id=88124
    Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Cc: Lyude <lyude at redhat.com>
    Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Lyude Paul <lyude at redhat.com>
    Acked-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20171003142211.860-1-jani.nikula@intel.com

Also fails with drm-tip 2018y-03m-12d-22h-06m-53s

I can track down other reporters but my setup was Lenovo T470s with dock to
HDMI monitor

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)

Happy to provide more information and point other reporters here.

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