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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