First step will be to verify that setting the brightness manually
(either using xrandr or through /sys/class/backlight/*/brightness) is
still functioning correctly. If that is, we can assert that the bug lies
in the ACPI handling of the key presses. Otherwise, the bug lies
somewhere in the chain of applying the brightness (which may lead us
back to ACPI again...).
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1049117
Title:
FN UpArrow and DownArrow shortcut for screen brightness is broken
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