Second screen - DisplayPort

[amuza]

Hello!

I'm new to Guix system, yesterday I installed it for the first time. I
installed it with i3 and Mate.

I would like to use my second monitor, but its DisplayPort connection is
not recognized by xrandr. xrandr only shows my own laptop's screen.

If I connect my second monitor through VGA, xrandr does detect that VGA
connection.

The DisplayPort connection worked fine with Trisquel, I could use my
second monitor, so I guess it's not an issue on software Freedom.

Any suggestion on how to make Guix detect my DisplayPort-connected monitor?

Thank you!

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