I noticed that during the shutdown sequence, the process involving brltty is recalcitrant to close, thus significantly delaying reaching the objective.
Now, according to some terminal magic, ‘brltty’ is required by qemu-chardev-baum.
I don’t really need brltty but, before forcing my way in, I’d like to know what chardev baum does exactly and if there is a way to peacefully rid my system of this annoying delay.
The best solution is to remove it. But if you have another package that requires it, you can omit it from dracut.
Create a file /etc/dracut.conf.d/nobrltty.conf with the contents:
omit_dracutmodules+=" brltty "
Then run sudo dracut-rebuild
Be aware that the problem won’t be solved until the reboot after the next reboot.
thank you for replying 
It seems like my primitive solution (basically beating qemu with a huge club) is still the best option. Okay fine, sometime elegance is not an option
If you remove the package brltty you will want to run sudo dracut-rebuild so it is removed from dracut as well.
