Re: [xmonad] Problem with Multi-head setup

Here is the way I understand it. Likely some of the following statements will be subtly wrong, and I apologize in advance for spreading my misconceptions about X. There are two distinct pieces of X called Xinerama. One of the pieces is a set of library calls used for communicating the size and locations of physical screens in logical space within a single DISPLAY. xmonad uses these library calls to break your physical screens into separate logical workspaces. As such, the library called xinerama is required for multi-head support. However, I understand that there are other ways of controlling multiple monitors, in particular running several different DISPLAYs under X, one for each screen. You may of course do this; then you must start a separate xmonad instance for each DISPLAY. There is currently no integration for this; i.e. no way to send windows from one DISPLAY to another (though I hear rumors that some window managers do have such capabilities). Other than those two options, I am not familiar with any other way of driving multiple monitors. Cheers, ~d Quoting Eric Thomas :

Sorry for the noob question, but why is xinerama required for xmonad to work? As I understand it, xinerama just makes your multi head setup appear as though there is one long screen. However, I like it when my screens are treated as two different desktops. Does xmonad not support this?

Eric Thomas

On Sat, Aug 22, 2009 at 4:55 PM, wrote:

...

Hi Eric,

It sounds like you haven't got the Xinerama extension running; getting that set up is not xmonad-specific. There are many excellent tutorials on setting up Xinerama on the web; Google should help here. (For example, try "setting up Xinerama", which pointed me to < http://www.ibiblio.org/pub/Linux/docs/HOWTO/Xinerama-HOWTO>.) It also depends slightly on what graphics card you are using. If you've got an nvidia card with the proprietary nvidia drivers, check out the man pages for nvidia-xconfig; other people here may have other suggestions for other cards.

Cheers, ~d

Quoting Eric Thomas :

Hello,

...

When attempting to setup xmonad on a dual setup, I cannot use the keyboard on the second monitor.

The following command: ghc -e "Graphics.X11.openDisplay [] >>= Graphics.X11.Xinerama.getScreenInfo"

generates this output: Xlib: extension "XINERAMA" missing on display ":0.1". [Rectangle {rect_x = 0, rect_y = 0, rect_width = 1280, rect_height = 1024}]

In the FAQ, its says to check my Xserver configuration, but I don't know what I need to check.

Any help would be appreciated.

Thanks,

Eric