On Fri, Sep 18, 2020 at 3:10 PM Chris Murphy <lists@colorremedies.com> wrote:
Using virt-manager, F8 increases the sound on my laptop.

Then it's not F8 :D Either configure your keyboard (in BIOS, in runtime) to use Fx keys instead of multimedia keys, or pressing Fn+F8 should actually send F8, at least that's how most systems do it.
 
For whatever
reason it never passes through to the VM only. And two of three
computers F8 is reserved for the firmware.

You have to hit it at the right moment, which can be very tricky :-/

Stephen says you can hit any key to make GRUB show, I couldn't verify that yet.