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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: Emacs 22.0.50 and suspending while logged into another system
Date: Wed, 11 Oct 2006 14:50:45 -0400
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Xref: news.gmane.org gmane.emacs.bugs:15364
Archived-At: <http://permalink.gmane.org/gmane.emacs.bugs/15364>

    Control characters stop being interpreted, and instead show up in the edit 
    buffer text.  In addition, foreground emacs does not redraw the screen.

I think wrong terminal modes are being installed.
Can you investigate using GDB what happens during init_sys_modes?