Andrea Rossato on 2007-08-18 08:13:13 +0200:
On Fri, Aug 17, 2007 at 08:08:23PM -0500, Alec Berryman wrote:
(please ignore previous patch - I forgot to update the README)
The attached patch allows the user to override Xinerama detection. I have the Xinerama headers installed because Debian's GTK+ development packages require it, but I only have one screen; for some reason, probably related to the laptop's VGA out, xmonad thinks there's a second one and I lose a workspace. The attached patch allows the user to pass the --without-xinerama to configure to manually disable xinerama.
I believe you should investigate your X installation, since your patch should not be needed. XMonad uses getScreenInfo to see whether it's running in a Xinerama environment or not.
I first noticed this a month or two ago and gave my X installation a cursory glance; I didn't enable Xinerama, but did upgrade xorg, xorg drivers, and xmonad at all about the same time, which didn't help me track anything down (not that I had the time). My solution then was to just uninstall Xinerama headers, but that's no longer an option for me; the patch I sent is the most expedient remedy for my problem.