/lib/udev/keymaps/onkyo is in udev 175-0ubuntu9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | 0xA0 mute # Fn+D
0xAE volumedown # Fn+F
0xB0 volumeup # Fn+G
0xDF sleep # Fn+W
0xE0 bluetooth # Fn+H
0xE2 cyclewindows # Fn+Esc
0xEE battery # Fn+Q
0xF0 media # Fn+R
0xF5 switchvideomode # Fn+E
0xF6 camera # Fn+T
0xF7 f21 # Fn+Y (touchpad toggle)
0xF8 brightnessup # Fn+S
0xF9 brightnessdown # Fn+A
0xFB wlan # Fn+J
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