Stop Asus ROG Falchion mechanical keyboard from sending POWER and SLEEP key presses when the keyboard goes to sleep. Put in /etc/udev/hwdb.d and then run sudo systemd-hwdb update

99-asus-falchion.hwdb

evdev:input:b*v0B05p193Ee0111*
  KEYBOARD_KEY_10081=reserved
  KEYBOARD_KEY_10082=reserved
  KEYBOARD_KEY_70070=reserved
  KEYBOARD_KEY_70071=reserved
  KEYBOARD_KEY_70072=reserved
  KEYBOARD_KEY_70073=reserved
  KEYBOARD_KEY_70074=reserved
  KEYBOARD_KEY_70075=reserved
  KEYBOARD_KEY_70076=reserved
  KEYBOARD_KEY_70077=reserved

I think I found the answer in USB HID Usage Tables 1.5: https://usb.org/sites/default/files/hut1_5.pdf
I think 10081 and 10082 correspond to 81 and 82 (System Power Down and System Sleep) in Generic Desktop Page (0x01).

The ones beginning with 7 correspond to values in Keyboard/Keypad Page (0x07), right?

I think I found the answer in USB HID Usage Tables 1.5: https://usb.org/sites/default/files/hut1_5.pdf I think 10081 and 10082 correspond to 81 and 82 (System Power Down and System Sleep) in Generic Desktop Page (0x01).

The ones beginning with 7 correspond to values in Keyboard/Keypad Page (0x07), right?

Yes that is correct, however I have no idea why they are being sent simultaneous to the expected key codes. It could be a firmware bug, or maybe they trap the keycodes in their software and decided what keycode to pass to the host os depending on software settings. My main objective was just to get the keyboard functional under Linux.

Works perfectly on ChimeraOS. Thanks!

You can use my package https://aur.archlinux.org/packages/falchion-shutdown