/lib/udev/keymaps/module-ibm 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 15 16 | 0x01 battery # Fn+F2
0x02 screenlock # Fn+F3
0x03 sleep # Fn+F4
0x04 wlan # Fn+F5
0x06 switchvideomode # Fn+F7
0x07 zoom # Fn+F8 screen expand
0x08 f24 # Fn+F9 undock
0x0B suspend # Fn+F12
0x0F brightnessup # Fn+Home
0x10 brightnessdown # Fn+End
0x11 kbdillumtoggle # Fn+PgUp - ThinkLight
0x13 zoom # Fn+Space
0x14 volumeup
0x15 volumedown
0x16 mute
0x17 prog1 # ThinkPad/ThinkVantage button (high keycode: "vendor")
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