Hardware Configuration, Audio/Video
To check the information on which sound output is used type:
Example of command to choose the soundcard, that can also be inserted into /etc/sysctl.conf:
Radeon HDMI audio out
Partially supported Radeon video cards, linked to in the section GPU Hardware, usually don't support HDMI audio out. Other Radeon cards require extra configuration.
Here is a list of FreeBSD supported video cards, https://wiki.freebsd.org/Graphics .
Many Radeon cards are compatible with FreeBSD.
Nvidia cards haven't always been compatible with FreeBSD, but recently they are and have video card support.
Use the program xrandr to be able to use and configure multiple monitors. With this program, a basic video card can use both of it's HDMI and DVI outputs for dual configured monitors.
Example of command line that can be used in the file .xinitrc:
xrandr --output DVI-0 --right-of HDMI-0
To see the obsolete way of configuring dual monitors for Nvidia cards, see Dual Screen