[Bug 97991] New: [i915, Surface Pro 4] Regression: No display port output in kernel 4.8

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97991

            Bug ID: 97991
           Summary: [i915, Surface Pro 4] Regression: No display port
                    output in kernel 4.8
           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: mikael at djurfeldt.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126907
  --> https://bugs.freedesktop.org/attachment.cgi?id=126907&action=edit
dmesg output when booting the drm-nightly kernel

I have been able to use both builtin screen and an external monitor on my
Surface Pro 4 up until and including kernel 4.7. However 4.8-rc8 as well as
drm-nightly from Thursday evening (Sept 29) does not at all present the
external monitor when I do xrandr and it is black.

x86_64
4.8.0-rc8-mssp4+
Debian Stretch
Surface Pro 4
eDP-1 works but DP-1 is not visible (as it is for 4.7)

Attaching dmesg.

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