Apparently, though unproven, at 00:08 on Thursday 18 November 2010, Florian Philipp did opine thusly:
> Hi list! > > Today, KDE nearly killed a presentation I held and now I want to > understand what's going on: > > Following setup: One laptop, two outputs (internal display + projector). > > Now I configure KDE to expand the desktop on both (instead of simple > cloning). So far, so good. For anyone to help at all, we'll need to know your hardware and video drivers, plus versions in use of X.org and it's drivers, plus relevant config stuff. Everything else is highly configurable and subject to the whim of driver writers and the user. And there's always nVidia's stance to be taken into account as well > > First question: How does KDE choose on which output the "standard" > desktop ends up and which gets the second set of desktop background + > plasma widgets? It seems like the one with the higher resolution is > standard and on a draw, it is the right-most. Is that correct? Can it be > configured? > > Now that I have both desktops, I open Acroread or Okular and start the > fullscreen/presentation mode. What happens is that the presentation is > deterministically opened on one of the displays. What I don't understand > is how it chooses which one it uses? > > It doesn't depend on the placement of the window (although other > applications like Flash in Firefox, MPlayer, Kaffeine and Gwenview do). > It doesn't always open on the secondary or standard desktop (as > specified above). It rather seems like it always opens on the one with > the higher resolution and if both are equal, it opens on the left-most. > > So, what happened when I tried to hold my presentation? The projector > had a low resolution (1024x768) and therefore neither Acroread nor > Okular showed on fullscreen on the projector. None of my previous tests > showed that problem since I used two displays with equal resolution. > Great fun! In the end, I cloned the output and thereby gave Okular no > other choice. (Lucky me that I didn't any additional notes or anything > on the other display ...) > > What can I do to influence this behavior? > > Edit: I just noticed that both applications have settings for this. > However, they are ignored and the setting in Acroread is even reset to > "Current display" each time I close the settings dialog! What is going > on here? > > Thanks in advance! > Florian Philipp -- alan dot mckinnon at gmail dot com
