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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Can't turn on laptop screen without changing its resolution first"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70406#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Can't turn on laptop screen without changing its resolution first"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70406">bug 70406</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>After the first modeset to switch on the LVDS, the backlight is set to 0.
Can you please check what xrandr --verbose --output LVDS1 reports after that
initial modeset (and the LVDS is still blank) and then try playing with xrandr
--output LVDS1 --set Backlight <x> and directly setting /sys/class/backlight/*</pre>
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