[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 #9 from Johannes Krampf <johannes.krampf at gmail.com> ---
Created attachment 142659
  --> https://bugs.freedesktop.org/attachment.cgi?id=142659&action=edit
Dmesg of drm-tip + backlight patch on T440s

Same drm-tip version as the the last comment + the backlight patch.

The backlight was working before the patch. That is, there was a clear
difference between the black screen after boot and the black screen after xset
dpms force off.

With the patch, the backlight was off after boot as well and there was no
difference before and after xset dpms force off.

I could see boot messages on the screen for a split-second after exiting the
boot loader. It appeared that the screen was half-filled (top-to-bottom) with
messages before it turned off. Maybe this information helps in determining the
timing of the problematic action.

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