In the old days, I configured acpid to launch
vlock-cmatrixreloaded when I press Fn + F2, now it no longer works since systemd handles TTYs, I just got a screen flash when I press those keys.
The only way to invoke it is launch it manually from a tty or xterm, anyway to fix that?
Fn is a standard function key (like shift) on laptops, and acpi_listen prints:
button/screenlock SCRNLCK 00000080 00000000 K
And in acpid's handler.sh:
button/screenlock) /usr/bin/vlock-cmatrixreloaded -ans ;;