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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#c20">Comment # 20</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>I think we need to check how the BIOS has programmed the backlight. Please boot
without loading i915, and then do the following:
intel_reg read 0x48250 0x48254 0x48350 0x48354 0x48360 0x48260 0x48264 0x48268
0x48400 0xc8250 0xc8254
You can get intel_reg from igt-gpu-tools/intel-gpu-tools.</pre>
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