Here is a workaround from Aaron Lu on linux-acpi: specify the backlight
option in xorg.conf.

Section "Device"
    Identifier  "Default Device"
    Option     "Backlight"    "intel_backlight"
    Driver      "intel"
    BusID       "PCI:0:2:0"
EndSection

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https://bugs.launchpad.net/bugs/1178796

Title:
  8086:2a42 [Asus UL80VT] Backlight control does not work with Intel
  integrated card, but there are entries in /sys/class/backlight

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