This sounds like an X configuration issue. You may be able to create or edit /etc/X11/xorg.conf to have multiple screens. But debugging that is rather annoying. I had a video setup on a box where the driver was buggy such that I was stuck in the same situation you are in. I used layoutScreens[1] to work around the issue. This module allows you to divide your single large screen into sections that xmonad will treat just like separate screens. If you choose your actual monitor layout and sizes it will work just how you want.

[1]http://xmonad.org/xmonad-docs/xmonad-contrib/XMonad-Layout-LayoutScreens.html

It still may be worthwhile to debug your xorg.conf but this workaround is useful to have in your bag of tricks.

Cheers,

Chris Wills

On Thu, Oct 2, 2014 at 4:50 AM, Mario Pastorelli <pastorelli.mario@gmail.com> wrote:

Hi xmonaders,

I have decided to move my XMonad install inside a sandbox to avoid problems when packages are updated. I'm able to run XMonad with cabal exec xmonad and I'm very happy with it. My only problem is that XMonad cannot use Xinerama for some reason: if I configure two displays then I get a single display which is the union of the first one with the second one. I cannot find any way to use displays as independent. What I'm doing wrong? MATE is able to use Xinerama without problems and X11, XMonad and XMonad-contrib are built with xinerama:

> ldd ../../xmonad/.cabal-sandbox/bin/xmonad
...
libXinerama.so.1 => /usr/lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007f86f66e8000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f86f63b2000)
libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007f86f61a8000)
...

I have libxinerama:

> ghc -e Graphics.X11.Xinerama.compiledWithXinerama
True

And Xorg starts with Xinerama:

> grep -i xinerama /var/log/Xorg.0.log
[ 13.627] Initializing built-in extension XINERAMA

I don't know what's wrong...how can I understand what's going on?

Thanks in advance,
Mario
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