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https://github.com/morgan9e/systemd
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udevadm info /dev/input/event4 P: /devices/platform/i8042/serio0/input/input4/event4 N: input/event4 L: 0 S: input/by-path/platform-i8042-serio-0-event-kbd E: DEVPATH=/devices/platform/i8042/serio0/input/input4/event4 E: DEVNAME=/dev/input/event4 E: MAJOR=13 E: MINOR=68 E: SUBSYSTEM=input E: USEC_INITIALIZED=4165584 E: KEYBOARD_KEY_81=f20 E: KEYBOARD_KEY_89=battery E: KEYBOARD_KEY_8a=screenlock E: KEYBOARD_KEY_8b=camera E: KEYBOARD_KEY_8c=media E: KEYBOARD_KEY_8e=dvd E: KEYBOARD_KEY_92=brightnessdown E: KEYBOARD_KEY_97=brightnessup E: KEYBOARD_KEY_b1=help E: KEYBOARD_KEY_b3=unknown E: KEYBOARD_KEY_d7=wlan E: KEYBOARD_KEY_ee=switchvideomode E: KEYBOARD_KEY_68=unknown E: ID_INPUT=1 E: ID_INPUT_KEY=1 E: ID_INPUT_KEYBOARD=1 E: ID_BUS=i8042 E: ID_SERIAL=noserial E: ID_PATH=platform-i8042-serio-0 E: ID_PATH_TAG=platform-i8042-serio-0 E: XKBMODEL=pc105 E: XKBLAYOUT=us E: BACKSPACE=guess E: LIBINPUT_DEVICE_GROUP=11/1/1:isa0060/serio0 E: DEVLINKS=/dev/input/by-path/platform-i8042-serio-0-event-kbd E: TAGS=:power-switch: E: CURRENT_TAGS=:power-switch:
Files in this directory specify a description of hardware devices, in the form of mappings from modalias-like keys (which identify specific hardware devices) to udev properties. Files in this directory are not read by udev directly. Instead, man:systemd-hwdb(8) compiles them into a binary database. See man:hwdb(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of the udev daemon. Use 'systemd-analyze cat-config udev/hwdb.d' to display the effective config.