Uwe Brauer composed on 2017-08-02 08:18 (UTC):

> I am using a Thinkpad X200s with a Intel Graphic card which supports
> dual screens. I have installed first Kubuntu 14.04 and then trinity on
> top of that (I know this approach is not recommended. It would have been
> better to use the trinity Live CD, but I don't want to reinstall
> everything).

> Now I found out about dspdfviewer which allows (for beamer latex
> generated pdf) to show the transparencies in two screens.

> I tried that out with my laptop being connected to a external LCD
> screen, however my laptop screen only was cloned and the dspdfviewer
> developers told me to try out extended desktop mode.

> I looked up a bit the trinity kontrol center but could not find anything
> relevant.

> So a pointer would be very well come. I would not mind a link to a
> command tool such as xrand (which was recommended to me as well).

If Trinity Control Center's peripherals display size & orientation screen's
select list of settings for screen doesn't allow other than screen 1, then
install arandr from Ubuntu's standard repos and try it.
-- 
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