Hi, attached the image of the garbled text (maybe it helps).

On Wed, 2011-06-08 at 16:15 +0530, Krishna Karthik wrote:
> When I connect another monitor and extend the desktop onto it text in
> emacs has display problems.  The text appears to be overlapped.  Each
> character also appears just before itself.  When the cursor is blinking
> the character before it also blinks. This is temporarily corrected with
> C-l. 
> 
> This is not reproducible if the extended monitor is removed and emacs
> started again.
> 
> Thank you.
> 
> 
> In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.22.0)
>  of 2011-03-04 on roseapple, modified by Debian
> Windowing system distributor `The X.Org Foundation', version
> 11.0.10900000
> configured using `configure  '--build=i686-linux-gnu'
> '--host=i686-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
> '--libexecdir=/usr/lib' '--localstatedir=/var/lib'
> '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
> '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i686-linux-gnu' 'host_alias=i686-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''
> 
> Important settings:
>   value of $LC_ALL: nil
>   value of $LC_COLLATE: nil
>   value of $LC_CTYPE: nil
>   value of $LC_MESSAGES: nil
>   value of $LC_MONETARY: nil
>   value of $LC_NUMERIC: nil
>   value of $LC_TIME: nil
>   value of $LANG: en_IN
>   value of $XMODIFIERS: nil
>   locale-coding-system: iso-latin-1-unix
>   default-enable-multibyte-characters: t
> 
> Major mode: Fundamental
> 
> Minor modes in effect:
>   tooltip-mode: t
>   mouse-wheel-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   blink-cursor-mode: t
>   global-auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   line-number-mode: t
>   transient-mark-mode: t
> 
> Recent input:
> M-x r e p o <tab> r t <tab> <return>
> 
> Recent messages:
> Loading /usr/share/emacs/site-lisp/haskell-mode/haskell-site-file.el
> (source)...done
> Loading /etc/emacs/site-start.d/50haskell-mode.el (source)...done
> Loading /etc/emacs/site-start.d/50html-helper-mode.el (source)...done
> Loading /etc/emacs/site-start.d/50org-mode.el (source)...done
> Loading /etc/emacs/site-start.d/50psvn.el (source)...done
> Loading /usr/share/emacs23/site-lisp/emacs-goodies-el/color-theme-library.el (source)...done
> Loading /usr/share/emacs23/site-lisp/emacs-goodies-el/color-theme-library.elc...done
> Loading /home/karthik/.emacs.d/site-lisp/themes/railscasts.el
> (source)...done
> For information about GNU Emacs and the GNU system, type C-h C-a.
> Making completion list...
>