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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #15 from Julius B. <freedesktop at blln.gr> ---
Created attachment 144310
  --> https://bugs.freedesktop.org/attachment.cgi?id=144310&action=edit
dmesg linux-next 20190517 without fastboot on Yoga

I can confirm the same behaviour as Johannes on the S1 Yoga with X11:

With fastboot I would very briefly (<second) see boot messages, then the screen
would go black, but with the backlight on. Finally, around the time I expect
X11 to have started, the screen went completely black with the backlight being
off.

However, I wasn't able to switch VTs, but I captured dmesg via ssh.

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