[Bug 108773] New: i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108773

            Bug ID: 108773
           Summary: i915.fastboot=1 is broken on Thinkpad S1 Yoga
                    (Haswell)
           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: f.zweig at yahoo.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I was following the information on
https://hansdegoede.livejournal.com/19224.html to enable flicker-free bot on
Fedora 29.

However, enabling i915.fastboot=1 results in the screen staying black during
and after boot. No login manager is shown, and I cannot switch VTs via
CTRL+ALT+F keys (as usual).

This happens on a Thinkpad S1 Yoga (Haswell platform), which incidentally I
know is one of the Haswell machines available for Intel employees.

Tested kernel versions:
Fedora kernels 4.18.18/19, 4.19.2-200 and 4.20.0-0.rc2.git2.1. 

I havent tested any mainline or git build yet. I reported
https://bugzilla.redhat.com/show_bug.cgi?id=1639437, and was referred to here.

I'll try to create a dmesg with debug information, and attach it here.

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