[Bug 70791] [HSW ULT]eDP brightness is zero after the computer start

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70791

--- Comment #1 from Qingshuai Tian <qingshuai.tian at intel.com> ---
Created attachment 88023
  --> https://bugs.freedesktop.org/attachment.cgi?id=88023&action=edit
dmesg(its brightness can't be changed by the function keys)

This dmesg is for the phenomenon when the brightness can't be changed by the
function keys and also can't find the file
(/sys/class/backlight/intel_backlight/brightness).

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