A workaround: the extra key events can be disabled by creating
/etc/udev/hwdb.d/70-keyboard.hwdb containing:

keyboard:dmi:bvn*:bvr*:bd*:svnDell*:pnLatitude*2110:pvr*
 KEYBOARD_KEY_85=unknown  # Brightness Down, also emitted by acpi-video, ignore
 KEYBOARD_KEY_86=unknown  # Brightness Up, also emitted by acpi-video, ignore

This is based on the existing rules for the Dell Inspiron 1520.  If I
also disable video.brightness_switch_enabled, then I get a backlight
that changes brightness by one step for each keypress.  I have had two
rather worrying hangs  while testing this, though.

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https://bugs.launchpad.net/bugs/1397699

Title:
  [Dell Latitude 2110] Clicking brightness key once increments
  brightness as if pressed multiple times

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