[xmonad] Re: Issue 402 in xmonad: Xmonad becomes unresponsive. No focus changing (using keys or mouse), workspace changing or recompile.

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Comment #10 on issue 402 by daniel.wagner: Xmonad becomes unresponsive.  No  
focus changing (using keys or mouse), workspace changing or recompile.
http://code.google.com/p/xmonad/issues/detail?id=402

Yeah, okay, your pipe to xmobar is filling up. You have two choices. One is  
to use the StdinReader add-on or module or whatever they call it for xmobar  
(adding it both to the list of commands *and* to the template). The other  
is to change your xmonad config to use spawn instead of spawnPipe and take  
xmobar out of your log hook. It would look something like this:

main = do
     xmonad $ withUrgencyHook NoUrgencyHook
            $ defaultConfig {
                 terminal           = "urxvt",
                 modMask            = mod4Mask,
                 borderWidth        = myBorderWidth,
                 workspaces         =  
["1", "2", "3", "4", "5", "6", "7", "8", "9"],
                 normalBorderColor  = "#00e0ff",
                 focusedBorderColor = "#f92672",
                 manageHook         = myManageHook,
                 keys               = myKeys,
                 mouseBindings      = myMouseBindings,
                 layoutHook         = myLayout,
                 startupHook        = spawn "xmobar"
     }

See also  
http://haskell.org/haskellwiki/Xmonad/Frequently_asked_questions#XMonad_is_frozen.21