gentoo and lightdm: mouse freezes/inactive in lightdm greeter

Sometimes, when PC starts, mouse will be inactive in lightdm greeter (only keyboard will work). You can try disabling mouse suspend:

sudo nano /etc/systemd/system/lightdm.service.d/delay.conf and add options usbcore autosuspend=-1 then rebuild initramfs (if drakut) sudo dracut --force