[Unit]
Description=Hardware RNG Entropy Gatherer Wake threshold service
Before=rngd.service

[Service]
CapabilityBoundingSet=CAP_SYS_ADMIN
AmbientCapabilities=CAP_SYS_ADMIN
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/sh -c "PSIZE=$(cat /proc/sys/kernel/random/poolsize); let THRESH=$PSIZE*3/4; echo $THRESH>/proc/sys/kernel/random/write_wakeup_threshold; udevadm trigger --sysname-match=hw_random --settle"

[Install]
WantedBy=sysinit.target