No MergedXinerama for xrandr

[Hal V. Engel]

On Monday 01 June 2009 02:23:14 pm Quinn Harris wrote:
> On Sunday 31 May 2009 8:02:31 pm Alex Deucher wrote:
> > On Sun, May 31, 2009 at 6:49 PM, Quinn Harris <quinn at qutek.net> wrote:
> > > Before many video drivers changed from MergedFB to xrandr 1.2 for a
> > > dual head video card they had an option like "NoMergedXinerama"
> > > for the Radeon driver that would make the two screens appear as one to
> > > the window manager.  Does a similar option exist somewhere now
> > > with xrandr 1.3?  Is there a way to completely disable a window
> > > managers awareness of multiple screens?
> > >
> > > I have a Viewsonic VP2290b that needs to be driven by two DVI ports to
> > > run at full resolution at a usable refresh rate (24hz).  But I
> > > don't want the desktop (KDE 4.2) to treat the single monitor like two
> > > in any way.
> >
> > It's all handled in the common xserver code now for xrandr 1.2 rather
> > than in the drivers.  Your best bet is probably to turn off xinerama
> > support in your window manager.
> >
> > Alex
>
> I also noticed mplayer and Xine also recognized multiple monitors.  The
> Firefox "awesome bar" adjusts where it shows based on the monitor edge that
> doesn't actually exist in my configuration.  I wasn't able to find an
> option in KDE 4.2 to ignore Xinerama or the like, but haven't looked hard.

This is actually handled by how Qt4 is built.  You need to build Qt without 
xinerama support and KDE4 (and all Qt4 apps) will treat it as a single device 
since Qt will not be using any xinerama hints.  This probably will not help 
with firefox, mplayer or xine.

>
> Something at the xserver level would be nice.  A global option or better
> yet a way to instruct xrandr to treat two or more specified screens as one
> to all X software.  This is basically another feature regression with
> xrandr and should probably be considered to be resolved in a future
> revision.
>
> Quinn Harris