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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108773#c23">Comment # 23</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108773">bug 108773</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>(In reply to Ville Syrjala from <a href="show_bug.cgi?id=108773#c22">comment #22</a>)
<span class="quote">> 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?</span >
Doh. Make that 'intel_reg read 0x42014'</pre>
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