/lib/udev/keymaps/acer-travelmate_c300 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 | 0x67 f24 # FIXME: rotate screen
0x68 up
0x69 down
0x6B fn
0x6C screenlock # FIXME: lock tablet device/buttons
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