/lib/udev/keymaps/force-release/samsung-90x3a 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 | # list of scancodes (hex or decimal), optional comment
0xCE # Fn+F8 keyboard backlit up
0x8D # Fn+F7 keyboard backlit down
0x97 # Fn+F12 wifi on/off
0x96 # Fn+F1 performance mode (?)
0xD5 # Fn+F6 battery life extender
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