[Bug 73156] Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73156

--- Comment #11 from Daiver <daiver at daiver.ru> ---
Maybe you can direct me what to investigate and how to find a mechanism to turn
on / off lights and control the second panel.

I can install Windows 8 and try to figure out what software from Asus provides
switching between displays.

In order to understand whether it is provided by the Intel driver for Windows
or this software from Asus.

Turn off and remove a variety software from Asus, on my impression that Intel
driver himself can enable or disable highlighting, although this requires
verification.

I would like to write a utility that can even turn on / off lights, and control
the brightness of an external monitor, even in manual mode.

Maybe you can suggest mechanisms through which this can be done, how it can be
seen. 

Maybe Intel has dedicated registers to control lighting or vice versa they are
not, and do not waste time.

Can be controlled via the ACPI or something else.

I think the first step is to find out through that control is exercised. 

On the second how.

Maybe you can recommend what to check ?

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