[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 #23 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Ville Syrjala from comment #22)
> Nothing remarkable in the backlight setup.
> 
> Hmm. Looks like the BIOS is using SPLL for eDP. We do seem to leave that
> correctly enabled, but maybe we're turning off its reference by mistake.
> It is using the SSC reference by the looks of it, but the question which one.
> 
> What does 'intel_reg read 0x42004' say?

Doh. Make that 'intel_reg read 0x42014'

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