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[verion GmbH <1348890@xxxxxxxxxxxxxxxxxx>]

This bug affects all current ASUS UX305FA models, tested with BIOS 206
and 207 and Kernel 3.19 and up to Kernel 4.0.4 from mainline. Kernel
parameters "acpi_osi=" or "acpi_backlight=intel" do not work at all,
"acpi_osi" only disables the WMI control (possibly another bug).

How are these ACPI events generated? If the BIOS does not supply the
event, maybe it must be enabled with some control sequence? (acpi_listen
mostly doesn't say anything if pressing Fn+F-keys.)

I saw that e.g. for newer hybrid touchpads, you need to initialize the
device with an ACPI command so that it will either work in PS2 or I2C
mode. Otherwise it will either be "off" or the mode is not what I
wanted. Maybe this works the same way here and we only have to enable
these key events?

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https://bugs.launchpad.net/bugs/1348890

Title:
  Asus UX32LN: Brightness keys Fn+F5 and Fn+F6 don't generate evdev
  event

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello Community,

  It seems brightness keys don't work with latest Ubuntu 14.04 LTS for
  laptop Asus Zenbook UX32LN.

  sudo dmidecode -s bios-version
  UX32LN.203

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