[Bug 91845] [HSW]i915 does 2s long DP-link-reset (backlight off) during modeset instead of re-using SimpleFB, stacktrace with i915.fastboot=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91845

--- Comment #12 from o.freyermuth at googlemail.com ---
Tried with latest drm-tip as of fb7048acaac8ece5ebc53f9b748b76cdcef60fa3 using
the same kernel configuration I used with 4.16.3 (after running make
oldconfig). 
I end up with a blank, but lighted screen *immediately* after the bootloader. 

Neither sysrq nor any other keypresses apart from turning the machine hard off
are working. 
No stacktraces found in pstore. 

Other ideas?

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