[xmonad] How to manage three monitors on two graphics cards?

[Rogan Creswick]

On Thu, Jan 5, 2012 at 10:53 AM, Wolfram Kahl <kahl at cas.mcmaster.ca> wrote:
>
> (2) In xorg.conf ServerFlags:
>       Option    "Xinerama" "true"
>
>     Now xrandr does not work anymore, and xmonad sees one big area.
>

It sounds like your xmonad install may not have support for xinerama.
That's relatively easy to fix, and there is a simple test.  See this
entry in the FAQ:

http://www.haskell.org/haskellwiki/Xmonad/Frequently_asked_questions#xmonad_does_not_detect_my_multi-head_setup

--Rogan