Re: [gentoo-user] KDE-4 multi-monitor + fullscreen applications

[BRM]

----- Original Message ----

> From: YoYo Siska <yoyo@××××××.sk>
> To: gentoo-user@l.g.o
> Sent: Thu, November 18, 2010 12:41:03 PM
> Subject: Re: [gentoo-user] KDE-4 multi-monitor + fullscreen applications
>
> On Wed, Nov 17, 2010 at 11:41:25PM +0100, Florian Philipp wrote:
> > Am  17.11.2010 23:26, schrieb Alan McKinnon:
> > > 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
> > >
> >
> > Ah, right, forgot  about that. Intel GMA HD graphics (i915 driver),
> >  x11-base/xorg-server-1.8.2 (USE="udev -hal") and  x11-base/xorg-drivers-1.8
> >
> > No xorg.conf. Tried it with composite  effects off and on.
> >
> > KDE is on version 4.4.5 and some packages  4.4.7 (current stable).
> >
> > >>
> > >> 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?
> xrandr 1.3 has a new option to say which output should be  'primary'
>
> you can try something like
>
> xrandr --output LVDS1 --mode  1024x768 --pos 0x0 --primary --output VGA1
> --mode 1024x768 --righ-of  LVDS1
>
> However IIRC kde used to ignore which display was primary (reported  as
> xinerama screen 0) and somehow decided on its own order...
>
> Here  okular works correclty (well, at least "Current screen" and "Screen
> XX" used  to work, don't remember for "Default screen" and can't test
> right now...),  but right now I'm using fluxbox as window manager and not
> kwin, but I it  would be weird if it actually made things break.. ;)
>


<snip>
You may be interested in this post by Aaron Seigo:

http://aseigo.blogspot.com/2010/11/multihead-plasma-desktop-needs-you.html

Also, check the KDE System Settings as I mentioned in my first post on this 
thread.
I don't have an Xorg config file, and yet I can do multiple displays through 
KDE;
I also don't configure xRandr. This is all independent of any video card; 
though,
as A. Seigo points out there are some issues still being fixed.

Not sure if you're trying to run multi-head or simply multi-screen; though I 
think
multi-screen since you don't have an xorg.conf file too. Please read Aaron's 
post.

Ben