130: Why doesn't my ExtendChar key work as a Meta key under HP-UX 8.0?

  This is a result of an internationalization extension in X11R4 and the
  fact that HP is now using this extension.  Emacs assumes that
  XLookupString returns the same result regardless of the Meta key state
  which is no longer necessarily true.  Until Emacs is fixed, the temporary
  kludge is to run this command after each time the X server is started but
  preferably before any xterm clients are:

    xmodmap -e 'remove mod1 = Mode_switch'

  NOTE: This will disable the use of the extra keysyms systemwide, which
  may be undesirable if you actually intend to use them.