[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

Johannes Krampf <johannes.krampf at gmail.com> changed:

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--- Comment #18 from Johannes Krampf <johannes.krampf at gmail.com> ---
Created attachment 144329
  --> https://bugs.freedesktop.org/attachment.cgi?id=144329&action=edit
Dmesg of drm-tip with fastboot on T440s

This is drm-tip version 307cedb7b907ee533bf9e746d0e06bea04f2722b from Thu May
23 12:49:55 2019 +1000. I used drm.debug=0xe on the kernel flags as requested.
Previously I had 0x1e.

The behaviour changed slightly with drm-tip:

On startup, I still get the sub-second flash with boot messages and then the
screen _including the backlight_ turns off. I can interact with the system
(wayland+VT), but get no screen output.

Please tell me if there's any other information I can provide (video of boot
process?) and I'll try to provide it.

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