On Sat, 28 Oct 2017 at 20:14:43 +0300
Lars Noodén <lars.nooden@???> wrote:
> I have two displays, one built-in to a laptop and another external, and
> am not able to get any signal to the external one. The same arrangement
> works fine with other distros. I've tried with the display managers for
> both XFCE4 and LXQt, as well as xrandr.
>
> For example, I have tried the following, but the external screen stays
> black:
>
> $ xrandr --output eDP-1 --auto \
> --output HDMI-1 --auto \
> --same-as eDP-1
>
> $ uname -sr; lsb_release -rd
> Linux 4.9.0-4-amd64
> Description: Devuan GNU/Linux 2.0 (ascii)
> Release: 2.0
>
> What should I be looking for with xrandr to cause a usable signal?
Check the output of xrandr --query for pointers.
Alessandro