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Emacs version is 24.2.1, OS: Linux Slackware 14.0. I am using fullscreen function to maximize it on startup. Clicking maximize button does the same.

But I mentioned, that it is not fully maximized. Look carefully at the screenshot. You'll see the words "About Slackware and FreeBSD ,Who is Fast?" from Firefox.

enter image description here

How can I make it fully maximize?

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The solution is here: userbase.kde.org/KWin_Rules_Application_Workarounds – user4035 Apr 21 '13 at 10:33

This code in .emacs works for me (Ubuntu 10.04) .. It uses two steps: emacs' maximize and then the Window Manager's maximize.

(require 'maxframe)
(add-hook 'window-setup-hook 'maximize-frame t)
(defun maximize-wm (&optional f)
       (x-send-client-message nil 0 nil "_NET_WM_STATE" 32
               '(2 "_NET_WM_STATE_MAXIMIZED_VERT" 0))
       (x-send-client-message nil 0 nil "_NET_WM_STATE" 32
               '(2 "_NET_WM_STATE_MAXIMIZED_HORZ" 0)))
(maximize-wm)
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This doesn't work. Seems to be a KDE interaction problem. – user4035 Apr 21 '13 at 10:23
1  
The solution is here: userbase.kde.org/KWin_Rules_Application_Workarounds – user4035 Apr 21 '13 at 10:29

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