OK, here's output from xev. I pressed the increase brightness
combination twice, and decrease combination once. It seems that the
first increase resulted in one even but all further presses resulted in
two events:

MappingNotify event, serial 40, synthetic NO, window 0x0,
    request MappingKeyboard, first_keycode 8, count 248

MappingNotify event, serial 41, synthetic NO, window 0x0,
    request MappingKeyboard, first_keycode 8, count 248

MappingNotify event, serial 42, synthetic NO, window 0x0,
    request MappingKeyboard, first_keycode 8, count 248

MappingNotify event, serial 43, synthetic NO, window 0x0,
    request MappingKeyboard, first_keycode 8, count 248

MappingNotify event, serial 44, synthetic NO, window 0x0,
    request MappingKeyboard, first_keycode 8, count 248

HTH

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https://bugs.launchpad.net/bugs/1069357

Title:
  Hardware keys change backlight brightness in much larger
  increments/steps than expected

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