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Pressing Fn+F10 on Acer Nitro 5 AN515-58 incorrectly triggers display brightness down (scancode 0xef) instead of keyboard backlight control, causing the screen to go completely dark. Similarly, Fn+F9 (scancode 0xf0) has no function explictily stated in hwdb causing unknown keycode debug messages. Both keys should control the keyboard backlight as labeled on the keyboard. Map scancodes 0xef and 0xf0 to kbdillumup and kbdillumdown respectively to enable proper keyboard backlight control.
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.