There is a work around for the backlight issue.

reference:  https://bugs.freedesktop.org/show_bug.cgi?id=67454

> 
> To get it running you need to download and build the driver:
> 
> # git clone https://github.com/patjak/mba6x_bl
> # cd mba6x_bl/ && make && make install
> 
> Make sure the module is loaded at boot time. E.g add "mba6x_bl" to
> /etc/modules
> You also need to configure i915 to hand over the backlight control to
> mba6x_bl. I added this to my /etc/X11/xorg.conf:
> 
> Section "Device"
>         Identifier      "Intel Graphics"
>         Driver          "intel"
>         Option          "Backlight"     "mba6x_backlight"
> EndSection
> 
> Now reboot and you should have working brightness even after suspend/resume.
> Unloading the module (modprobe -r mba6x_bl) will restore the backlight to
> whatever state we had when loading it.

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https://bugs.launchpad.net/bugs/1197482

Title:
  8086:0a26 [MacBook Air 6,2] After suspend/resume, screen is dark for
  brighness levels below 13 with i915 driver

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