I cannot use ^ with certain programs. I'm working in KDE on OpenSUSE 13.1 64b.
^ works as a dead key in Konsole, Firefox, Chrome, Gvim.
^ has no effect (pressing ^ then a just inserts a) in Xterm, Emacs, Opera, Libreoffice.
My /etc/X11/xorg.conf.d/90-keytable.conf
Section "InputClass"
Identifier "LocalKeyboard"
MatchIsKeyboard "on"
Option "XkbLayout" "ch"
Option "XkbVariant" "fr"
EndSection
UPDATE
In answer to Gilles' comment, I post xdv output for ^
KeyPress event, serial 40, synthetic NO, window 0x4800001,
root 0x25e, subw 0x0, time 19371288, (-553,369), root:(297,392),
state 0x10, keycode 21 (keysym 0xfe52, dead_circumflex), same_screen YES,
XLookupString gives 1 bytes: (5e) "^"
XmbLookupString gives 0 bytes:
XFilterEvent returns: True
UPDATE 2
Here's the output of env | grep IM
QT_IM_MODULE=ibus
CACHESTALLTIME=12
XDG_RUNTIME_DIR=/run/user/1000
GTK_IM_MODULE=ibus
QT_IM_SWITCHER=imsw-multi
EDIT 3
I have solved the problem for emacs gui adding the line in .emacs:
(load-library "iso-transl")