[Bug 70406] Can't turn on laptop screen without changing its resolution first

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70406

--- Comment #12 from reztho at archlinux.us ---
It is the backlight. 

After the first modeset, I can increase it with both, your xrandr command or
directly to /sys/class/backlight/intel_backlight/brightness and see that
actually the first modeset activated the screen but with the backlight at 0.

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