[Bug 100385] New: [i915] Screen freezes (X still works) after switch from EFI VGA to inteldrmfb, if booted with DP connected, if connected after boot everything works.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100385

            Bug ID: 100385
           Summary: [i915] Screen freezes (X still works) after switch
                    from EFI VGA to inteldrmfb, if booted with DP
                    connected, if connected after boot everything works.
           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: fdsktop at rtur.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130448
  --> https://bugs.freedesktop.org/attachment.cgi?id=130448&action=edit
dmesg boot log with DisplayPort connected

Configuration: 
 Lenovo x230 on a Ultrabase series 3 docking station,
 connected to a LG 22MP57VQ-P Display through a
 DisplayPort to DVI-D adapter.
 I'm running Arch Linux with the current drm-tip
 kernel 4.11.0-1. 

Problem Description:
 If I boot with the Display connected through Displayport,
 the console output freezes after the message:
    fb: switching to inteldrmfb from EFI VGA
 I still can log in at this point and the display works
 again as soon as X is started (see dmesg_DP_connected_boot 
 attachment). But if I try to switch to a TTY the 
 screen goes blank, if switched back to X everything works again.

 If I boot without the Displayport connection everything works, 
 nothing freezes. Even after attaching the display
 through DisplayPort everything works (TTY switch works also).
 (see dmesg_DP_connected_after_boot attachment in my next comment.)

Steps to reproduce:
 Boot with Displayport connected Display.

 If I forgot some important information please let me know and
 I'll provide it, also if you need a tester for this I would
 gladly be of assistance.

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